國立臺南大學教師基本資料

基本資料
姓名 林大偉
系所 機電系統工程研究所
職稱 教授
電話 0935588655
校內分機 7821
傳真
辦公室/研究室 榮譽C103-1
E-mail david@mail.nutn.edu.tw
網址 http://myweb.nutn.edu.tw/~david/
專長/研究領域 最佳化,機電整合,分子動力學,能源工程
 

畢業學校國別主修學門學位修業期間
清華大學中華民國核子工程學士1988~1992
華梵大學中華民國機電工程碩士1996~1998
成功大學中華民國機械工程博士1998/09~2004/06

服務機關部門 / 系所職稱服務期間
西門子公司核能工程組工程師1990/08~1994/07
華梵大學機電工程系技士1994/08~2004/07
興國管理學院資訊管理系助理教授2004/08~2005/07
遠東科技大學機械工程系助理教授2005/08~2007/07
遠東科技大學機械工程系副教授2007/08~2008/07
台南大學機電系統工程所副教授2008/08~2012/01

著作
名稱W.M. Yan, H.Y. Li , and David. T.W. Lin, 1999, Mixed convection heat transfer in a radially rotating square duct with radiation effects, Int. J. Heat Mass Transfer, Vol. 42, pp.35-47. (SCI)(NSC85-2212-E-211-005)
年度1999
類別期刊論文
摘要 
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名稱David. T.W. Lin and W.M. Yan, 2000, Experimental study of unsteady thermal convection in heated rotating inclined cylinders, Int. J. Heat Mass Transfer, Vol. 43, pp.3359-3370. (SCI)(NSC87-2212-E-211-006)
年度2000
類別期刊論文
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名稱W.M. Yan and David. T.W. Lin, 2001, Natural convection heat and mass transfer in vertical annuli with film evaporation and condensation, Int. J. Heat Mass Transfer., Vol. 44, No. 6, pp.1143-1153. (SCI)(NSC87-2212-E-211-006)
年度2001
類別期刊論文
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名稱David. T.W. Lin and C.K. Chen, 2004, A molecular dynamics simulation of TIP4P and Lennard-Jones water in nanochannel, ACTA Mechanica, Vol. 173, pp.181-194. (SCI)(NSC92-2212-E-006-002)
年度2004
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名稱C.K. Chen and David. T.W. Lin, 2005, TIP4P potential for lid-driven cavity flow, ACTA Mechanica, Vol. 178, pp.223-237. (SCI)(NSC92-2212-E-006-002)
年度2005
類別期刊論文
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名稱David. T.W. Lin and C.Y. Yang, 2005, The heat transfer analysis of nanoparticle heat source in Alanine tissue by molecular dynamics, Int. J. Biological Macromolecules, Vol.36, pp.225-231. (SCI)
年度2005
類別期刊論文
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名稱David. T.W. Lin and Y.C. Hu, 2006, A molecular dynamics study of thermal ablation, Proc. of the 1st IEEE Int. Conference NEMS, pp.596-600, Zhuhai, China, January 18-21.(SCI) (NSC94-2212-E-269-017)
年度2006
類別期刊論文
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名稱Y.C. Hu, David. T.W. Lin and G.D. Lee, 2006, A closed form solution for the pull-in voltage of the micro bridge with initial stress subjected to electrostatic loads, Proc. of the 1st IEEE Int. Conference NEMS, pp.759-763, Zhuhai, China, January 18-21.(SCI) (NSC94-2212-E-211-006)
年度2006
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名稱David. T.W. Lin and Y.C. Hu, 2006, A molecular dynamics study of thermal ablation, IEEE Review on Adv. in Micro, Nano, and Molecular Sys., Vol.1, pp.275-276. (NSC94-2212-E-269-017)
年度2006
類別期刊論文
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名稱Y.C. Hu, David. T.W. Lin and G.D. Lee, 2006, A closed form solution for the pull-in voltage of the micro bridge with initial stress subjected to electrostatic loads, IEEE Review on Adv. in Micro, Nano, and Molecular Sys., Vol.1, pp.349-350. (NSC94-2212-E-211-006)
年度2006
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名稱David. T.W. Lin, 2007, A molecular dynamics on the thermally developing flow of Alanine in nano-channel, IEEE Review on Adv. in Micro, Nano, and Molecular Sys., Vol.2, in Press. (NSC94-2212-E-269-017)
年度2007
類別期刊論文
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名稱Y.C. Hu, C.S. Wei, C.C. Hsiao, and David. T.W. Lin, 2007, Extracting the Young’s modulus and stress gradient of thin films from the pull-in voltage of a micro curled cantilever beam, IEEE Review on Adv. in Micro, Nano, and Molecular Sys., Vol.2, in Press.(NSC95-2221-E-211-008-MY2)
年度2007
類別期刊論文
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名稱David. T.W. Lin, 2007, A molecular dynamics on the thermally developing flow of Alanine in nano-channel, Proc. of the 2nd Annual IEEE Int. Conference NEMS, pp.131-135, Bangkok, Thailand, Jan. 16-19.(SCI)(NSC94-2212-E-269-017)
年度2007
類別期刊論文
摘要
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名稱Y.C. Hu, C.S. Wei, C.C. Hsiao, and David. T.W. Lin, 2007, Extracting the Young’s modulus and stress gradient of thin films from the pull-in voltage of a micro curled cantilever beam, Proc. of the 2nd Annual IEEE Int. Conference NEMS, pp.278-281, Bangkok, Thailand, Jan. 16-19.(SCI) (NSC95-2221-E-211-008-MY2)
年度2007
類別期刊論文
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名稱P. J. Cheng, David. T.W. Lin, 2007, Surface waves on viscoelastic magnetic fluid film flow down a vertical column, Int. J. Engineering Science, Vol. 45, pp.905-922. (SCI)(NSC95-2221-E-269-027)
年度2007
類別期刊論文
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名稱 David. T.W. Lin, 2007, A study of local effect and global effect on the micro thermal bio-flows by molecular dynamics, Int. J. Biological Macromolecules, Vol. 41, pp.260-265. (SCI) (NSC95-2221-E-269-025)
年度2007
類別期刊論文
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名稱David. T.W. Lin and C.Y. Yang, 2007, The estimation of the strength of the heat source in the heat conduction problems, Applied Mathematical Modeling, Vol. 31, pp.2696-2710. (SCI)
年度2007
類別期刊論文
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名稱David. T.W. Lin, W.M. Yan, H.Y. Li, 2008, Inverse problem of unsteady conjugated forced convection between parallel plates, Int. J. Heat Mass Transfer, Vol. 51, pp.993-1002. (SCI) (NSC95-2221-E-269-025)
年度2008
類別期刊論文
摘要 
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名稱David. T. W. Lin, C.Y. Yang, R.Y. Wang and Y.C. Hu, 2008, An improved molecular dynamics algorithm for the larger momentum molecular system, Proc. of the 3rd Annual IEEE Int. Conference NEMS, Sanya, China, Jan. 6-9.(EI) (NSC95-2221-E-269-025)
年度2008
類別期刊論文
摘要 
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名稱Estimating the wall heat flux of unsteady conjugated forced convection between two corotating disks using an inverse solution scheme
年度2008
類別期刊論文
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名稱Hydromagnetic instability of a gravity-driven electrically conductive pseudoplastic liquid film
年度2008
類別期刊論文
摘要The long-wave perturbation method is employed to investigate the hydromagnetic stability of a thin electrically-conductive pseudoplastic liquid film flowing down the surface of a vertical wall in a magnetic field. The validity of the numerical results is improved through the introduction of the flow index and the magnetic force into the governing equation. In contrast to most previous studies presented in the literature, the solution scheme employed in this study is based on a numerical approximation approach rather than an analytical method. The normal mode approach is used to analyze the stability of the film flow. The modeling results reveal that the flow stability can be enhanced by increasing the intensity of the magnetic field and the flow index, respectively. In general, the instability state can be neutralized through an appropriate control of the applied magnetic field.
關鍵字Thin film, Hydromagnetic stability analysis, Pseudoplastic fluid
名稱David. T. W. Lin, C.Y. Yang, R.Y. Wang and Y.C. Hu, 2008, An improved molecular dynamics algorithm for the larger momentum molecular system, IEEE Review on Adv. in Micro, Nano, and Molecular Sys., Vol.3, in Press.(NSC95-2221-E-269-025)
年度2008
類別期刊論文
摘要 
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名稱C.C. Wang, David. T.W. Lin, H.P. Hu, 2009, Error Analysis of Approximate Solutions of Non-linear Burgers’ Equation, Applied Mathematics and Computation, Vol. 212, pp. 387-395.(SCI)
年度2009
類別期刊論文
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名稱C.T. Wang, K.Y. Huang, David. T.W. Lin, W.C. Liao, H.W. Lin, and Y.C. Hu, 2010, A flexible proximity sensor fabricated by fully inkjet printing, Sensors, Vol. 10, pp. 5054-5062.(SCI)
年度2010
類別期刊論文
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名稱N.S. Pai, C.C. Wang*, and David. T.W. Lin, 2010, Bifurcation analysis of a microcantilever in AFM system, J. Franklin Institute, Vol. 347, pp. 1353-1367. (NSC97-2221-E-269-016)(SCI)
年度2010
類別期刊論文
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名稱David T.W. Lin, C.C. Wang*, C.Y. Yang, and J.C. Li, 2010, Inverse estimation of temperature boundary conditions with irregular shape of gas tank, Int. J. Heat Mass Transfer, Vol. 53, pp. 4651-4662. (SCI ) ( Engineering, Mechanica)
年度2010
類別期刊論文
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名稱David. T.W. Lin, H.T.X. Chi, C.C. Chang, C.C. Wang, and C.N.Huang, 2010, The optimal design process of the plate heat exchanger, 2010 IEEE International Symposium on Computer, Communication, Control and Automation. Tainan, Taiwan, May 5-7.
年度2010
類別期刊論文
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名稱David. T.W. Lin, H.T.X. Chi, C.C. Chang, C.C. Wang, and C.N.Huang, 2010, The optimal design process of the plate heat exchanger, 2010 IEEE International Symposium on Computer, Communication, Control and Automation Proceedings, Vol. 2, pp. 237-240.(SCI-ISTP, EI) (NSC98-2221-E-269-016)
年度2010
類別期刊論文
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名稱David. T.W. Lin*, C.N. Huang, and C.C. Chang, 2010, The optimization of the heat removal on the LED package, in press, Int. J. Advanced Science Letters. (SCIE)
年度2010
類別期刊論文
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名稱C.N. Huang*, David. T.W. Lin, and C.C. Chang, 2010, Optimal parameter design for permanent-magnet synchronous generators used in the small-scale wind powers, in press, Int. J. Advanced Science Letters. (SCIE)
年度2010
類別期刊論文
摘要
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名稱Optimal Parameter Design for Permanent-magnet Synchronous Generators Used in the Small-scale Wind Powers
年度2011
類別期刊論文
摘要Due to the generators used in the small-scale wind powers must be characterized with high efficiency and low cogging torque to meet the operation demands. However, above characteristics are conflicting. They are difficult to approach a compromise for the optimal design. In order to serve the optimization problems with multiple conflicting objectives, in this paper a novel method of integrating the Taguchi’s method and fuzzy inference to optimize the parameter design is presented. The CAD simulator, RMxprt, is used to aid the design and numerical analysis. Besides, a real permanent-magnet synchronous generator unit is implemented to confirm the effectiveness of the proposed method.
關鍵字Optimal Design, Taguchi’s Method, Fuzzy Inference, Wind Power, Cogging Torque, Permanent- Magnet Synchronous Generator
名稱A Molecular Dynamics Study of the Heat Transfer Phenomena in the Bio-tissue
年度2011
類別期刊論文
摘要The purpose of this study is to obtain the heat transfer phenomena of bio-tissue by the external heating. The molecular dynamics (MD) algorithm and the GROMACS protein data bank are used to analyze the bio-heat transfer characteristics of Alanine molecules in the micro-scale. The simulations focus specifically on the temperature evolution and thermal conductivity of the Alanine molecules under different kinds of thermal boundary conditions. The thermal conductivity of the Alanine molecule is calculated via the autocorrelation function of the Green-Kubo formalism. Overall, the results presented in this study provide a useful source of reference for improving the efficacy of thermal ablation and the phenomena of the micro-scale hyperthermia.
關鍵字Molecular dynamics, GROMACS protein data bank, Alanine, Bio-tissue, Green-Kubo formalism
名稱高功率電子散熱技術發展趨勢
年度2011
類別期刊論文
摘要電子元件的運算速度愈來愈快且體積越來越小,相對的在元件內所植入的電晶體之密度也愈來愈高,其所造成的晶片上單位面積的發熱量也愈大。因此電子冷卻成為重要的課題,其中衝擊噴流結合散熱片在電子散熱中有較高散熱效率,由於散熱片具有高熱傳導、散熱面積大、成本低等優點,再搭配衝擊噴流之強制對流所產生的高熱對流係數,可產生極佳的散熱效果。因此衝擊噴流結合散熱片的冷卻方式,具有快速、高效率和局部冷卻等優勢,更能在有限的空間內進行散熱。本文係探討高速噴流下冷卻於鰭片型散熱片的傳熱現象,利用有限元素法將模擬的結果與文獻之實驗進行比對,以驗證模擬結果之準確性,並針對衝擊噴流的雷諾數、鰭片幾何尺寸與噴嘴至鰭片距離的變化進行分析。
關鍵字
名稱Hydromagnetic Stability Analysis of a Film Coating Flow Down A Rotating Vertical Cylinder
年度2011
類別期刊論文
摘要The influence of both the Rossby number and the Hartmann number on the hydromagnetic stability of a thin liquid film flowing down along the surface of a vertical ylinder is investigated. The long-wave perturbation method is employed to solve for generalized nonlinear kinematic equations with a free film interface. The normal mode approach is used to compute the stability solution for the film flow. The modeling results indicate that the stability of the liquid film is enhanced by increasing the strength of the magnetic field or reducing the speed at which the cylinder rotates. By contrast, the flow becomes relatively more unstable as the cylinder radius is increased at larger values of the Rossby number. Notably, this finding is the opposite of that observed for film flows along a stationary vertical cylinder.
關鍵字Hydromagnetic stability analysis, Hartmann number, Rossby number.
名稱The Study of the Heat Transfer Analysis on the Plate-fin Heat Sinks by the Impinging Jet Flow
年度2011
類別期刊論文
摘要This paper aims at investigating the heat transfer phenomena of the plate-fin heat sinks under impinging jet cooling. The impinging jet cooling has the advantage of larger heat removal. The finite element method is used to simulate the heat transfer phenomena of the plate-fin heat sinks under impinging jet cooling. The simulation results are verified by comparing with the experimental data. The parameters discussed in this study include the fin size, the Reynolds number and the impingement distance. The results of this study show that the effect of Reynolds number dominates to the heat removal. The heat removal increases with the Reynolds number obviously. In addition, the temperature profile on the fin surface is affected by the arrangement of the fin.
關鍵字impingement distance; impinging jet; plate-fin heat sink; Reynolds number
名稱Inverse Estimation of Unknown Heat Flux Boundary with Irregular Shape Fins
年度2011
類別期刊論文
摘要The purpose of this study is to estimate the unknown heat flux boundary conditions on the irregular shape fins for expanding the application of the inverse method. An inverse algorithm based on the sequential method and the concept of future time combined with the finite element package is used to determine the 2-D irregular shape heat conduction problems. Special features about the proposed method are that the stiffness matrix of the irregular shape can be solved from the finite element package. The estimated results are considered under the different kinds of fin types, the future time, the sensor’s location, the sensor’s number, the measured errors and the function of heat flux boundary. These estimated results are agreed with the exact solution even in the irregular shape fin. The results of this study show that this proposed method is an accurate, stable, and efficient method for solving the realistic engineering heat conduction problems.
關鍵字Irregular shape fins, Inverse method, Future time, Finite element method
名稱Optimization of Thermal Management by Integration of An SCGM, A Finite-Element Method, and An Experiment on A High-Power LED Array
年度2011
類別期刊論文
摘要This paper proposes an original idea to minimize heat concentrations of high-power light-emitting diode (LED) arrays. The purpose of this paper is to investigate temperature distribution with and without an optimal process of high-power LED arrays by experiment and a numerical method in order to achieve an optimal design of LED arrays for thermal management. This paper develops an effective method to design each LED position for decreasing thermal concentrations in high-power LED arrays. In this paper, temperature profiles are measured by a thermal infrared camera and a thermocouple and compared with simulated results under different power. The optimal method is adopted by a simplified conjugate gradient method combined with a finite-element method. This method proves reliability of simulated results in advance. Through this optimal method, efficiency of heat removal will be enforced as an extra cooling device is added. The important part is that this optimal design will not affect brightness through an illumination analysis.
關鍵字Experiment, light-emitting diode (LED) array,optimization, simplified conjugated gradient method (SCGM)
名稱The Optimization of the Heat Removal on the LED Package
年度2011
類別期刊論文
摘要The aim of this article attempts to explore the optimal design of the high power LED package related the thermal characteristics. To achieve the optimal design of the size of the slug inside the LED package is our purpose to improve the heat removal. The simplified conjugate-gradient method (SCGM) is adopted to combine with the finite element method to optimize the shape of the slug inside the LED package. The results show that the shape of the slug changing directly affects the temperature profile inside the LED. The heat generated from die of the LED can be removed more by the change of the slug. It is obvious that the proposed method is effective on thermal optimization of the LED package. This proposed method may give rise to a new insight and more innovative possibilities in the development of the new generation LED.
關鍵字Optimal Design, LED Package, SCGM
名稱The Optimization of the Thermal Response on the ZnO Pyroelectric Film Temperature Sensor
年度2012
類別期刊論文
摘要In a previous study, the present group designed and fabricated ZnO thin-film pyroelectric sensors with four different upper electrode configurations, namely rectangular, criss-cross, target and web. However, the voltage response of the proposed devices was not formally analyzed. Accordingly, the present study commences by performing an experimental investigation to determine the voltage-temperature transfer function for one of the four electrode configurations (i.e., rectangular). An optimization algorithm based on the simplified conjugate gradient method (SCGM) and COMSOL finite-element analysis software is then applied to establish the optimal geometry parameters of each of the four upper electrode configurations. It is shown that the optimized electrode designs improve the temperature variation rate of the four sensors by a minimum of 15%. As a result, the responsivity of the proposed devices is significantly improved.
關鍵字Optimization, SCGM, thermal response, ZnO pyroelectric film sensor
名稱Effects of the Thermal Lag Ratio on the Behavior of Bio-heat Transfer
年度2012
類別期刊論文
摘要The dual-phase-lag heat transfer model is applied to investigate the behavior of heat transfer in a perfused tissue with instantaneous surface heat flux. The lag times, Tq and Tt, are the characteristic of the dual-phase-lag model. A modified numerical scheme is used to solve the problem for exploring the effects of Tq and Tt on the bio-heat transfer. The influence of blood perfusion rate on the thermal response in tissue is investigated. The deviations with the thermal wave model of bioheat transfer and the Pennes model are presented. The results show that the dual-phase-lag model of bioheat transfer can be reduced to the Pennes model not only if both phase lag times of the temperature gradient Tt and the heat flux Tq are zero. The total effect of Tq and Tt on the bio-heat transfer may be different for the same Tt/Tq value.
關鍵字Dual-phase-lag model, Hybrid method, Perfused tissue
名稱Optimization of the Shell-and-tube Heat Exchanger by Simplified Conjugated Gradient Method
年度2012
類別期刊論文
摘要This study is to obtain the optimal design of the heat removal of the 3D shell-and-tube heat exchanger (STHE) by integrating multiphysics script based on the finite element method (FEM) with the simplified conjugate-gradient method (SCGM). A numerical investigation of the performance of a STHE considered the tube distance and array type is conducted. The objective function is to obtain the maximum quantities of temperature difference between the inlet and outlet of the heat exchanger. After determining the optimal shape size, this study evaluates the thermal performance of the heat exchanger by varying the quantities of heat removal and efficiency. In addition, we obtain the synthesis for all the advantages of this proposed method.
關鍵字Optimization Design, Shell-and-Tube Heat Exchanger, SCGM, FEM
名稱A Three-dimensional Numerical Modeling of Thermoelectric Device with Consideration of Coupling of Temperature Field and Electric Potential Field
年度2012
類別期刊論文
摘要Thermoelectric devices (TEs) can achieve direct conversion of heat and electricity by semiconductor materials, coupling of heat transfer and electric conduction is important to accurately predict the performance of TEs. This paper develops a general, three-dimensional numerical model of TEs with consideration of coupling of temperature field and electric potential field. The model is used to figure out the performance of thermoelectric coolers (TECs) with the temperature-dependent thermal conductivity, electric conductivity, and Seebeck coefficient of semiconductor materials. A miniature TEC is considered and Bi2(Te0.94Se0.06)3 and (Bi0.25Sb0.75)Te3 are selected as the n-type and p-type thermoelectric materials, respectively. The effect of parameters such as the temperature difference and the current is investigated under conditions of variable material properties as well as radiation and convection heat transfer occurred between the TEC and the ambient gas. The results show that the variable properties and the heat losses to the ambient gas have significant effects on the cooling capacity and the coefficient of performance (COP) of the TEC. Three-dimensional temperature distributions within the semiconductors is observed under convective boundary condition and it becomes remarkable at large temperature differences and high currents.
關鍵字Thermoelectric device, Numerical modeling, Coupling of temperature and electric potential, Variable properties, Convective boundary conditions
名稱A solution Processed ZnO Thin Film
年度2012
類別期刊論文
摘要The effect of Zinc-Oxide (ZnO) thin film annealed in different ambiences is presented. To achieve low cost and environmentally friendly process, ZnO aqueous solution is synthesized by dissolving zinc acetate dihydrate in deionized water directly. Zinc oxide aqueous solution of high solubility and stability is presented. High quality and dense Zinc oxide thin film is formed by spin coating. Annealing temperatures are in the range of 300 °C~500 °C, and annealing ambiences of both air and N2 are discussed.
關鍵字Thin Film Transistor, Thin Film Property, ZnO, Solution Process
名稱The Study of Molecule List Algorithm based on the Large Momentum Molecular System
年度2012
類別期刊論文
摘要The purpose of this paper is to propose an modified list method based on the Verlet neighbor list for the large momentum system in the molecular dynamics field. The list updated mechanism of this method is controlled by the momentum of each molecule. The variation of the list is more apparent and rapid as the systems momentumincreasing through this study. Therefore, the list updated timing is realistic than the traditional Verlet neighbor list in the large momentum system, such as the nano-flow problem. It is applicable to construct the reasonable calculation and benefit to the improvement of MD’s calculation.
關鍵字Molecular dynamics, Modified Verlet list, Verlet neighbor list
名稱Optimal Design of the Composite Laminate Vessel based on SCGM
年度2012
類別期刊論文
摘要The purpose of this study is to optimize the design of the composite laminate vessel for minimizing the stress concentration. The optimum design of this study uses the finite element method combined with the simplified conjugated gradient method (SCGM) to find the minimization of Von Mises stress of the vessel. In this study, the composite laminate vessel with the aluminum liner and the carbon fiber/epoxy layer are considered. The winding angle and the thickness of composite layer are proposed as the optimal design variables. Through this optimization, the best combination of the thickness and the winding angle of composite layer can be obtained to reach the minimum stress concentration.
關鍵字Composite laminate vessel, Stress concentration, Optimal design, SCGM
名稱The Innovated Flexible Surface Acoustic Wave Devices on Fully Inkjet Printing Technology
年度2013
類別期刊論文
摘要An innovated fabricated process of the flexible surface acoustic wave (SAW) device is proposed in this study. Fully inkjet printing and sol-gel technology are used in this fabricated process. The flexible SAW device is composed of a ZnO layer sandwiched in between a flexible polyimide plastic sheet and two sets of interdigital transducers layer. The material of the top interdigital transducer layer is nano silver. The ZnO solution is prepared by sol-gel technology. Both the ZnO and top interdigital transducer layers are deposited by inkjet printing. The fully inkjet printing process possesses the advantages of direct patterning and low-cost. It does not require photolithography and etching processes since the pattern is directly printed on the flexible sheet. The center frequency of this prototype is matched with the design frequency. The prototype demonstrates that the presented flexible SAW device is available for the possible application in future. It may be applied to the sensing on curve surface
關鍵字Surface Acoustic Wave Device, Fully Inkjet Printing, ZnO
名稱The Improvement of Parameters of Manufacturing Process on Flexible Surface Acoustic Wave Device
年度2013
類別期刊論文
摘要This study issues the improvement of the parameters of manufacturing on the flexible SAW device. The better piezoelectric characteristics of ZnO film will be obtained. The Sol-Gel method is used to prepare the ZnO solution and deposits ZnO film by spin coating process. X-ray diffraction (XRD) and scanning electron microscope (SEM) are used to get the crystalline property. The results reveal that ZnO film possesses better crystalline property in 400RPM of spin speed. The piezoelectric intensity of (002) direction is 1566.67 (a.u.) and atomic morphology of ZnO film are exhibited by SEM image. This better ZnO film will enhance the wave propagation of surface acoustic wave (SAW) device. It can also expand the application of SAW device.
關鍵字SAW sensor, ZnO film, Piezoelectric material, Sol-Gel method
名稱Development of An Novel Adaptive Suspension System based on Ball-screw Mechanism
年度2013
類別期刊論文
摘要For the passive and semi-active suspensions are characterized as with constant parameters which cannot cope with time-variant road conditions, the suspension results are difficult to be satisfied. Although, the active ones are better than previous two on suspension performance, until now which are still far from real application for the drawbacks of complicated structure, large volume, costly, and difficult maintenance. Here, Ball Screw (BS) is with the characteristics of smaller volume, precise positioning, and well handling high-speed forward and backward transmissions. Instead of hydraulic or pneumatic mechanisms used for vehicle suspension, BS is adopted to be the main body of the proposed New Adaptive Suspension System (NASS). Besides, in order to overcome the unavoidable time-delay resulted from mechanical or computational operations, the Kalman filter, integrated with suspension controller, is used to estimate the road conditions. The effectiveness and feasibility of this proposal are confirmed through simulation studies.
關鍵字Adaptive Suspension, Ball Screw, Kalman Filter (KF)
名稱The Design of Heat Pipe Heat Exchanger CO2 EGS
年度2013
類別期刊論文
摘要The findings of new energy and energy harvester are the important issues for the lacking of fossil energy. For the purpose of the effective usage of supercritical CO2 flowed from the product well of CO2 EGS (Enhanced Geothermal System), an innovative heat pipe heat exchanger (Hx) is designed and practiced in this study. This study presents an innovative Hx of heat pipe for extracting the heat from CO2 or warm gas. By using the heat pipe for cooling gas is the fundamental idea of this Hx. The experimental apparatus of Hx consists a heating blower to blow out hot gas, a circulating cool water device, and a set of heat pipes. The efficiency of Hx is approved as the increasing air velocity and the more fins gradually. This innovative heat pipe exchanger is proofed through our experiment. This heat pipe Hx is suitable for the application of enhanced geothermal system (EGS) and more energy harvesting application.
關鍵字Heat pipe, Heat exchanger, Efficiency, EGS
名稱Geometry Optimization of Thermoelectric Coolers Using Simplified Conjugate Gradient Method
年度2013
類別期刊論文
摘要This paper develops an inverse problem approach to optimize the geometric structure of TECs (thermoelectric coolers). The approach integrates a complete multi-physics TEC model and a simplified conjugate-gradient method. The present TEC model couples the heat and electrical conductions and accounts for all physical mechanisms occurred within TECs. Three geometric parameters, the semiconductor pair number, N, leg length of semiconductor column, Hpn, and base area ratio of semiconductor columns to TEC, g, are optimized simultaneously at fixed current and fixed temperature difference. The cooling rate on the cold end is the objective function to be maximized to obtain the optimal TEC geometry. The effects of applied current and temperature difference on the optimal geometry are discussed. The results show that at temperature difference of 20 K, the geometry optimization increases the TEC cooling rate by 1.99e10.21 times compared with the initial TEC geometry, and the optimal N decreases from 100 to 47 with invariable g ? 0.95 and Hpn ? 0.2 mm, as the applied current varies from 1.0 A to 3.0 A. With the increase in temperature difference, the optimal N increases at smaller currents of I  1.0 A, however, it is almost invariable at larger currents of I  1.5 A.
關鍵字Thermoelectric cooling, Numerical modeling, Coupling of temperature and electric potential, Simplified conjugate-gradient method, Optimization
名稱Optimal Design of the Composite Laminate Hydrogen Storage Vessel
年度2013
類別期刊論文
摘要The purpose of this study is to optimize the design of a composite laminate hydrogen storage vessel for minimizing stress concentration. The optimum design of this study uses the finite-element method combined with a simplified conjugated gradient method (SCGM) and genetic algorithm (GA) to find the minimization of von Mises stress of the composite laminate hydrogen storage vessel. In this study, a composite laminate hydrogen storage vessel with an aluminum liner and a carbon fiber/epoxy layer are considered. The winding angle and thickness of the composite layer are proposed as optimal design variables. The comparison between SCGM and GA is discussed in order to obtain a promising optimum in design process. Through this optimization, the best possible combination of winding angle and thickness of composite layer has been obtained to obtain minimum possible stress concentration. Copyright c 2012 John Wiley & Sons, Ltd.
關鍵字composite laminate hydrogen storage vessel; stress concentration; optimal design; SCGM; GA
名稱The Study of the Percutaneous Laser Disc Decompression
年度2013
類別期刊論文
摘要The purpose of this study is to discuss the temperature and stress distribution problem of the interverbral disc while the surgical operation of PLDD is processing. This study also further discuss the water content of disc changes with age to cause variation of thermal conductivity thermal expansion coefficient specific heat and related parameters, and the effect of thermal conductivity related about the patients age will be illustrated. The 3D thermal structure conjugated model of the multiphysics analysis algorithm is used to understand the temperature and stress distribution of the whole domain and heat transfer phenomena under the different kinds of laser heating rate and patients. The temperature profile of the intervertebral disk is obtained and reveals the relations among the parameters. The temperature profile is predicted as the heat transfer phenomena can be handled on the surgical process. In the future, we expect that this result can be used to handle the PLDD in the pre-surgical simulation.
關鍵字
名稱An Experimental Study on the Compatibility of Acetone and Aluminum Flat Plate Heat Pipe
年度2014
類別期刊論文
摘要This study investigates the compatibility of aluminum flat-plate heat pipes (FPHPs) used for filling acetone as a working fluid after long-term operation of and the non-condensable gas (NCG) exhausting process. The rate of NCG generation substantially decreased after conducting the NCG exhausting process, proving the compatibility of acetone with the aluminum FPHPs. However, the thermal resistance was not enhanced because hydroxide bayerite (Al(OH)3) was generated as a product of the reaction.
關鍵字
名稱Experimental Study of Heat Transfer for Supercritical Carbon Dioxide with Upward Flow in Vertical Tube
年度2014
類別期刊論文
摘要In this study heat transfer of supercritical carbon dioxide in vertical tube with 10 mm of inner diameter and 1800 mm of length was investigated experimentally. The initial temperature of tube wall was set to 150 and 200°C. The system pressures of supercritical carbon dioxide are 1100, 1500 and 2000 psi, respectively. The experimental results show that the heat transfer coefficient and heat transfer rate increase with Reynolds number. The maximum heat transfer coefficient and heat transfer rate was occurred in 1500 psi of system pressure. The heat transfer coefficient for 150°C is higher than that of 200°C resulted from effect of specific heat.
關鍵字Supercritical fluid, Enhanced Geothermal System (EGS), Carbon dioxide
名稱A Method Integrating Optimal Algorithm and FEM on CMOS Residual Stress
年度2014
類別期刊論文
摘要Residual stress in MEMS is of inherent importance in various respects. This study proposes a specific method using ANSYS including the birth and death method and combined with the optimal method (SCGM) to reduce the residual stresses during the CMOS fabrication process. The suitable cooling temperature for decreasing the residual stress is proposed and available. It demonstrates that the suitable parameter on the fabrication can reduce the residual stress in MEMS devices without any extra manufacturing process or external apparatus. The proposed method can expand to simulate the realistic MEMS model effectively.
關鍵字Optimization, Residual stress, CMOS fabrication, SCGM
名稱Performance Study of Heat Pipe Heat Exchanger for Ground Source Heat Pump
年度2014
類別期刊論文
摘要The findings of new energy and energy harvester are the important issues for the lacking of fossil energy.For the purpose of the effective usage of supercritical CO2 flowed from the product well of CO2 EGS (Enhanced Geothermal System), an innovative heat pipe heat exchanger (Hx) is designed and practiced in this study. This study presents aninnovativeHx of heat pipe for extracting the heat from CO2 or warm gas. By using the heat pipe for cooling gas is the fundamental idea of this Hx. The experimental apparatus of Hxconsists a heating blower to blow out hot gas, a circulating cool water device, and a set of heat pipes. The efficiency of Hx is approved as the increasing air velocity and the more fins gradually. This innovative heat pipe exchanger is proofed through our experiment. This heat pipe Hx is suitable for the application of enhanced geothermal system (EGS) and more energy harvesting application.
關鍵字Heat pipe, Heat exchanger, Efficiency, EGS
名稱The Optimal Design of the Thermal Spreading on the High Power LEDs
年度2014
類別期刊論文
摘要New energy and energy saving are the two basic energy issues. This study proposes an innovative optimal method to design the LEDs with the high thermal spreading holder. The optimizationuses the FEM combined with the simplified conjugated gradient method (SCGM).The minimal temperature of the MCPCB backside of the LEDs is obtained throughout this design.The simulations have been proofed by the experiment of IR and thermal couple measurement. The optimal temperaturedecreases about compared with the original temperaturewithout anyactive cooling device.This design can prolong the LEDs’ life to benefit the energy saving obviously. In addition, this design combined with the active cooling device will achieve the better heat dissipation on the cooling of the electronic component.
關鍵字LEDs, Thermal spreading, Optimal design
名稱The Heat Extraction Investigation of Supercritical Carbon Dioxide Flow in Heated Porous Media
年度2015
類別期刊論文
摘要The purpose of this study is to obtain the heat extraction of the supercritical CO2 in the reservoir for the EGS. The heat transfer model conjugated with the Darcy’s law employed by the finite element package is used to obtain the thermal behavior in the porous medium. The sensitivity parameter study under the various inlet velocities and porosities of the porous medium are discussed. The results show that the inlet velocity is the most important effect for the heat extraction. The temperature of exit decreases as the inlet velocity increases apparently. It means that the heat extraction will increase as the velocity decreases. However, it is evident gradually as the porosity decreases. This study can enhance the heat extraction and reduce the cost of realistic test of enhanced geothermal system.
關鍵字Enhanced Geothermal Systems (EGS), Supercritical CO2 , Porous media
名稱Experimental Study of the Heat Transfer of Supercritical Carbon Dioxide in Silica-based Porous Media
年度2015
類別期刊論文
摘要The heat transfer phenomena of supercritical carbon dioxide are experimentally investigated in a vertical tube with silica-based porous media. The experiment is conducted for the various static pressure, the flow rate, the initial wall temperature, and nonporous or porous media. The results show that the heat transfer coefficient with porous media increases as the flow rate increases. Moreover, the excellent performance is exhibited at 10 MPa because of the effects of inlet temperature. In addition, the effects of the porosity and the initial wall temperature are weak through these results. This study will provide the effective data for regarding the operating conditions of the enhanced geothermal system.
關鍵字Geothermal, enhanced geothermal system (EGS), supercritical, carbon dioxide (CO2)
名稱W.M. Yan, H.Y. Li and David. T.W. Lin, 1997, Mixed convection heat transfer in a radially rotating square duct with radiation effects, Proceedings of the 21st National Conference on Theoretical and Applied Mechanics, Taichung, Taiwan, Dec. 20-21, pp.25-34.
年度1997
類別研討會
摘要 
關鍵字 
名稱David. T.W. Lin and W.M. Yan, 1998, Experimental study of natural convection heat transfer in heated rotating cylinders, 11th International Symposium on Transport Phenomena (ISTP11), Hsinchu, Taiwan, Nov.29- Dec.3, pp.238-243.
年度1998
類別研討會
摘要 
關鍵字 
名稱林大偉,顏維謀,1998,旋轉對傾斜加熱圓柱體內自然對流熱流之影響.中國機械工程學會第十五屆全國學術研討會,台南,台灣,十一月,pp.371-378。
年度1998
類別研討會
摘要 
關鍵字 
名稱W.M. Yan, H.Y. Li, and David. T.W. Lin, 1999, Radiation effects on mixed convection heat transfer in a square duct rotating about a parallel axis, 1999 National Heat Transfer Conference, Albuquerque, New Mexico, U.S.A., Aug.15-17.
年度1999
類別研討會
摘要 
關鍵字 
名稱林大偉,陳朝光,2000,分子動力學於空穴流上之研究,中國機械工程學會第十七屆全國學術研討會,高雄,台灣,十二月。
年度2000
類別研討會
摘要 
關鍵字 
名稱林大偉,陳朝光,2001,TIP4P分子勢能於平板完全發展流上之研究,中國機械工程學會第十八屆全國學術研討會,台北,台灣,十二月。
年度2001
類別研討會
摘要 
關鍵字 
名稱David. T.W. Lin and C.K. Chen, 2003, Molecular plane Poiseuille flow for the TIP4P and Lennard-Jones potentials, 6th ASME-JSME Thermal Engineering Joint Conference, Hawaii, U.S.A., March.16-20. (NSC90-2212-E-006-119)
年度2003
類別研討會
摘要 
關鍵字 
名稱林大偉,陳朝光,2004,奈米殼層之放熱過程於蛋白質中之熱傳分析. 中國機械工程學會第二十一屆全國學術研討會,高雄,台灣,十一月。
年度2004
類別研討會
摘要 
關鍵字 
名稱林大偉,王彥杰,朱柏翰,徐銘鴻,黃朝偉,陳翌航,2006,蛋白質流體於具熱邊界奈米流道之流場研究,中國機械工程學會第二十三屆全國學術研討會,台南,台灣,十一月。(NSC94-2212-E-269-017)
年度2006
類別研討會
摘要 
關鍵字 
名稱David. T.W. Lin, C.Y. Yang, P.J. Cheng, and K.C. Liu, 2006, An inverse study of boundary conditions in bio-heat conduction problems, 科技與管理學術研討會,台南,台灣,十二月。
年度2006
類別研討會
摘要 
關鍵字 
名稱David. T.W. Lin and Y.C. Hu, 2006, A molecular dynamics study of thermal ablation, The 1st IEEE Int. Conference NEMS, pp.596-600, Zhuhai, China, January 18-21. (NSC94-2212-E-269-017)
年度2006
類別研討會
摘要 
關鍵字 
名稱Y.C. Hu, David. T.W. Lin and G.D. Lee, 2006, A closed form solution for the pull-in voltage of the micro bridge with initial stress subjected to electrostatic loads, The 1st IEEE Int. Conference NEMS, pp.759-763, Zhuhai, China, January 18-21. (NSC94-2212-E-211-006)
年度2006
類別研討會
摘要 
關鍵字 
名稱David. T.W. Lin and C.Y. Yang, 2006, Inverse estimation of two-dimensional boundary conditions in bio-heat conduction problems, 17th International Symposium on Transport Phenomena (ISTP17), Toyama, Japan, September 4-8.
年度2006
類別研討會
摘要 
關鍵字 
名稱David. T.W. Lin, 2007, A molecular dynamics on the thermally developing flow of Alanine in nano-channel, The 2nd Annual IEEE Int. Conference NEMS, pp.131-135, Bangkok, Thailand, Jan. 16-19. (NSC94-2212-E-269-017)
年度2007
類別研討會
摘要 
關鍵字 
名稱Y.C. Hu, C.S. Wei, C.C. Hsiao, and David. T.W. Lin, 2007, Extracting the Young’s modulus and stress gradient of thin films from the pull-in voltage of a micro curled cantilever beam, The 2nd Annual IEEE Int. Conference NEMS, pp.278-281, Bangkok, Thailand, Jan. 16-19. (NSC95-2221-E-211-008-MY2)
年度2007
類別研討會
摘要 
關鍵字 
名稱David. T.W. Lin, W.M. Yan and H.Y. Li, 2007, The estimation of the strength of the heat source in the unsteady conjugated forced convection problem, The Asia Symposium on Computational Heat Transfer and Fluid Flow, Xi’an, China, October 17-21.
年度2007
類別研討會
摘要 
關鍵字 
名稱K.C. Liu and David. T.W. Lin, 2007, Thermal response in a perfused tissue with spatial heating, The Asia Symposium on Computational Heat Transfer and Fluid Flow, Xi’an, China, October 17-21.
年度2007
類別研討會
摘要 
關鍵字 
名稱王瑞詠,楊慶煜,林大偉,2007,分子動力學模擬之新分子表列法則,中國機械工程學會第二十四屆全國學術研討會,中壢,台灣,十一月。(NSC95-2221-E-269-025)
年度2007
類別研討會
摘要 
關鍵字 
名稱P.J. Cheng, K.C., Liu, and David. T.W. Lin, 2007, “Nonlinear hydromagnetic long-wave instability of a viscoelastic liquid layer flowing down a vertical cylinder,” The 31st National Conference on Theoretical and Applied Mechanics, Kaohsiung, pp. B05_1-8. (NSC 95-2221-E-269-027).
年度2007
類別研討會
摘要 
關鍵字 
名稱朱弋鵬,徐銘鴻,林大偉,陳翊航,蔡芳明,2008,於高速衝擊噴流下電子元件冷卻之熱傳分析,中國機械工程學會第二十五屆全國學術研討會,彰化,台灣,十一月。
年度2008
類別研討會
摘要 
關鍵字 
名稱朱弋鵬,陳翊航,林大偉,徐銘鴻,劉正堯,2008,經皮雷射椎間盤減壓術之暫態熱傳分析,2008年生物醫學工程年會暨科技研討會,林口,台灣,十二月。
年度2008
類別研討會
摘要 
關鍵字 
名稱David. T.W. Lin, C.Y. Yang, R.Y. Wang and Y.C. Hu, 2008, An improved molecular dynamics algorithm for the larger momentum molecular system, The 3rd Annual IEEE Int. Conference NEMS, Sanya, China, Jan. 6-9. (NSC95-2221-E-269-025)
年度2008
類別研討會
摘要 
關鍵字 
名稱C.Y. Yang, David. T.W. Lin, and P.J. Cheng, 2008, A study of bio-heat conduction problems by inverse estimation, Accepted by HEAT 2008, Fifth International Conference on Transport Phenomena In Multiphase Systems, Bialystok, Poland, June 30 - July 3.
年度2008
類別研討會
摘要 
關鍵字 
名稱C.Y. Liu, I.P. Chu, K.C. Liu and David. T.W. Lin, 2009, The analysis of the thermal structure conjugated problem of the percutaneous laser disc decompression, 20th International Symposium on Transport Phenomena (ISTP20), Victoria, British Columbia, Canada, July 7-10.
年度2009
類別研討會
摘要 
關鍵字 
名稱F.M. Tsai, I.P. Chu and David. T.W. Lin, 2009, The heat transfer analysis of plate-fin heat sinks by high velocity impinging jet flow, The Asia Symposium on Computational Heat Transfer and Fluid Flow, Jeju, Korea, October 20-23.
年度2009
類別研討會
摘要 
關鍵字 
名稱C.Y. Yang, I.P. Chu, P.J. Cheng, J.C. Hsieh, David. T.W. Lin and C.H. Cheng, 2009, The temperature optimization of high power LED array, The Asia Symposium on Computational Heat Transfer and Fluid Flow, Jeju, Korea, October 20-23.
年度2009
類別研討會
摘要 
關鍵字 
名稱J.C. Li, I.P. Chu, C.C. Wang, Y.C. Hu, C.Y. Yang and David. T.W. Lin, 2009, Inverse estimation of temperature boundary on the gas tank, The Asia Symposium on Computational Heat Transfer and Fluid Flow, Jeju, Korea, October 20-23.
年度2009
類別研討會
摘要 
關鍵字 
名稱M.J. Kuo, P.J. Cheng, C.Y. Yang, C.H. Cheng, and David T.W. Lin, 2009, The minimum of thermal resistance design of high power LED package, The 1st International Conference on Mechatronic System of Integration and Application 2009 (ICMS09), Tainan, Taiwan, Dec 4-5.
年度2009
類別研討會
摘要
關鍵字
名稱J.C. Li, C.C. Wang, C.Y Yang and David T.W. Lin, 2009, An analysis of the high pressure gas tank with inverse method, The 1st International Conference on Mechatronic System of Integration and Application 2009 (ICMS09), Tainan, Taiwan, Dec 4-5.
年度2009
類別研討會
摘要
關鍵字
名稱C.Y. Liu, C.H. Cheng, Y.C. Hu and David T.W. Lin, 2009, The optimum model approach of the shell-and-tube heat exchanger, The 1st International Conference on Mechatronic System of Integration and Application 2009 (ICMS09), Tainan, Taiwan, Dec 4-5.
年度2009
類別研討會
摘要
關鍵字
名稱C.Y. Yang, K.C. Liu, J.C. Hsieh, David T.W. Lin and C.H. Cheng, 2009, LED location design of high power LED array to the temperature optimization, The 1st International Conference on Mechatronic System of Integration and Application 2009 (ICMS09), Tainan, Taiwan, Dec 4-5.
年度2009
類別研討會
摘要
關鍵字
名稱F.M. Tsai, I.P. Chu, H.Y. Li., Y.C. Hu and David T.W. Lin, 2009, A numerical study of jet cooling effect on the pin fin heat sinks, The 1st International Conference on Mechatronic System of Integration and Application 2009 (ICMS09), Tainan, Taiwan, Dec 4-5.
年度2009
類別研討會
摘要
關鍵字
名稱W.C. Huang, I.P. Chu, J.C. Li, David T.W. Lin and C.H. Cheng, 2009, Shape design of the pressure vessels under the working pressure based on an optimal approach, The 1st International Conference on Mechatronic System of Integration and Application 2009 (ICMS09), Tainan, Taiwan, Dec 4-5.
年度2009
類別研討會
摘要
關鍵字
名稱H.J. Huang, S.C. Shen, David T.W. Lin and J.C. Hsieh 2009, Experimental study of high power LED array on flat plate heat pipe, The 1st International Conference on Mechatronic System of Integration and Application 2009 (ICMS09), Tainan, Taiwan, Dec 4-5.
年度2009
類別研討會
摘要
關鍵字
名稱David. T.W. Lin, and M.S. Suen, 2009, The heat transfer analysis of the protein flow on the micro channel by parallel molecular dynamics study and new molecular list algorithm, The 1st International Conference on Mechatronic System of Integration and Application 2009 (ICMS09), Tainan, Taiwan, Dec 4-5.
年度2009
類別研討會
摘要
關鍵字
名稱W.C. Huang, I.P. Chu, C.H. Cheng, David T.W. Lin,2009,Optimization of the shape design for pressure vessels,中國機械工程學會第二十六屆全國學術研討會,台南,台灣,十一月。
年度2009
類別研討會
摘要 
關鍵字 
名稱C.Y. Liu, C.H. Cheng, Y.C. Hu, David T.W. Lin,2009,Optimal design of the shell and tube heat exchanger,中國機械工程學會第二十六屆全國學術研討會,台南,台灣,十一月。
年度2009
類別研討會
摘要 
關鍵字 
名稱Using SCGM to optimize high power LED array design by combining experiment and finite element method
年度2009
類別研討會
摘要
關鍵字
名稱The optimal design process of the plate heat exchanger
年度2010
類別研討會
摘要
關鍵字
名稱The optimal design process of the plate heat exchanger
年度2010
類別研討會
摘要
關鍵字
名稱An intelligent vehicular control based on the gravity-shifting signals
年度2010
類別研討會
摘要
關鍵字
名稱J.C. Li, David. T.W. Lin, C.C. Wang and C.Y. Yang 2010, An analysis of inverse heat conduction problem on irregular shape fins, The 2010 IAENG International Conference on Industrial Engineering, HongKong, Mar 17-19.
年度2010
類別研討會
摘要
關鍵字
名稱W.C. Huang, J.C. Li, David. T.W. Lin 2010, An approach based on SCGM for the 3D shape optimization of the spherical vessel, The 2010 IAENG International Conference on Industrial Engineering, HongKong, Mar 17-19.
年度2010
類別研討會
摘要
關鍵字
名稱M.S. Suen, David. T.W. Lin, Y.C. Hu, 2010, A numerical study of the heat transfer phenomena on ZnO pyroelectric film sensor, The 2010 IAENG International Conference on Industrial Engineering, HongKong, Mar 17-19.
年度2010
類別研討會
摘要
關鍵字
名稱Design and optimization of the LED lamp holder
年度2010
類別研討會
摘要
關鍵字
名稱Optimal design of composite pressure vessel by using the genetic algorithm
年度2010
類別研討會
摘要
關鍵字
名稱Optimal residual stress in CMOS fabrication
年度2010
類別研討會
摘要
關鍵字
名稱新型主動式微型薄膜致冷器之熱傳分析
年度2011
類別研討會
摘要高功率電子元件損毀的原因通常是過度熱集中所導致,因熱無法有效快速地傳遞至散熱端,使元件之溫度不斷上升,造成元件故障。本研究主要目的是發展一主動式微型致冷器以應用於高功率LED或高單位面積熱集中元件之熱移除,利用致冷器內薄膜震動所導致之強制對流循環方式,將元件之熱量以熱擴散之方式快速移出,以達到快速移熱之效果。本研究將使用有限元素法商業軟體COMSOL,利用流固耦合模組和熱傳模組,並搭配移動網格技術,模擬此主動式微型致冷器應用於高單位面積熱集中元件時之熱傳現象。研究結果顯示,所提出之方法可以趨緩元件溫度之上升時間,達到熱量快速移除之效果。有效利用此主動式微型致冷器將能提升元件之效率、穩定性及使用壽命。本研究所提出方法適用於各式高功率元電子元件冷卻之設計,能有效將熱快速擴散,降低二次散熱元件之耗能。
關鍵字高功率電子元件、微型致冷器、熱擴散、有限元素法
名稱Optimal Design of the Electrothermal V-Beam Microactuator Based on GA for Stress Concentration Analysis
年度2011
類別研討會
摘要The stress concentration of the electrothemal microactuator is an important issue in the MEMS structure resulting from the existence of stress concentration essentially to change the performance and reduce the structural life time of MEMS devices. This paper proposes a method to optimize the fillet radius of the electrothermal V-beam microactuators due to bent beam connected with electrical pad. The genetic algorithm combines with the finite element method to design the optimal fillet radius of bent beam. A novel design of the fillet radius on V-beam actuator can significantly improve the stress concentration. In this study, we use the proposed method to design the beam width and thickness to obtain the relative minimum stress, firstly. Then, the optimal fillet radius can achieve by using the same method at the given beam width and thickness. The results show that the stress concentration can be reduced about 57.7% after optimization.
關鍵字Fillet radius, stress concentration, genetic algorithm
名稱The Heat Transfer Analysis of the Hyperbaric Oxygen Chamber with Cooling System
年度2011
類別研討會
摘要The overheated problem is the important issue in the operation of the hyperbaric oxygen chamber. A cooling system is applied to reduce the temperature of the hyperbaric oxygen chamber. We present the finite element method to build three types cooling system for solving the overheated phenomena in this problem. For achieving the better cooling way, this investigation considers different types of cooling channel and pressure of the chamber in this simulated process. These simulated results show that the proposed method is accurate, stable, and efficient for handling the heat transfer problems. We expect that the proposed study can apply to ameliorate the overheated problem effectively.
關鍵字Hyperbaric Oxygen Chamber, Overheat problem, Cooling System
名稱Using Genetic Algorithm to Minimize the Stress Concentration for Electro-Thermal Micro-actuator
年度2011
類別研討會
摘要The stress concentration of the electrothemal microactuator is an important issue in the MEMS structure resulting from the existence of stress concentration essentially to change the performance and reduce the structural life time of MEMS devices. The research proposes an optimal process using finite element method combined with the genetic algorithm programing by Matlab as an optimization for the shape design of the micro-actuator. The finite element method is to use the commercial package ANSYS to process the simulation and analysis. The analysis of the micro-actuator, which includes the displacement optimization, the output of the force optimization, the stress distribution are analyzed, and determines the most suitable geometric variables. Here, the optimal objective function is to find the maximum displacement, output force, and minimum Von Mises stress in the optimization of the shape design. By the variables of the shapes design, it is real to prove Von Mises stress distribution in the discontinuous location of the bend beam, and increase the lifetime expectancy of the micro-actuator. The proposed optimal process will establish an effective automated method for computer-aided design process, which is a good development for the MEMS development.
關鍵字MEMS, Micro-actuator, Stress concentration, Optimal design, Genetic algorithm
名稱The Design and Fabrication of the Vibration-induced Energy Harvester on the Heat Pipe Generator
年度2012
類別研討會
摘要The most important issue is to find the potential energy inside the heat pipe. The focus of this paper is on the investigation of using a vapor mode piezoelectric film for energy harvesting from a fluid flow. Design of the energy harvester with an assembly technique is described. The experimental setup is used to measure vapor velocity, and voltage output of the device. The fabricated device is tested under the different. It shows that a very small continuous power and can fit with the requirements of piezoelectric materials MEMS-scale sources. This design can improve the previous concepts of the heat pipe generator.
關鍵字
名稱The Fabrication of Flexible Surface Acoustic Wave Devices on Fully Ink Jet Technology
年度2012
類別研討會
摘要The flexible surface acoustic wave (SAW) device is a promising product for the expanded application of SAW device. Over the past few years, a very few attempts have been made it on the flexible substrate. The purpose of this study is to propose an innovated process for abricating the flexible SAW devices by sol-gel technology and fully ink jet technology. The ZnO solution is repared by sol-gel technology and deposits on the flexible olyimide plastic (PI) substrate by fully ink jet process. Next, the high gain amplifier and an impedance match circuit are consisted be a surface acoustic wave device. Through the comparison between the predicted value and experimental center frequency, the experimental center frequencies agree with the predicted value and operate. Finally, the analysis of surface acoustic wave propagation characteristics is used the Finite Element Method (FEM).The numerical model will be built for optimization in future.
關鍵字
名稱An Experimental Study for Compatibility of the Aluminum-Acetone Flat Plate Heat Pipe
年度2012
類別研討會
摘要The advantage of aluminum heat pipe is cost and weight. The ammonia is typically used as working fluid in aluminum heat pipe. Because of the toxicity of ammonia, the ammonia-aluminum heat pipe is not used in general user. The acetone is considerable due to low toxicity. However, little literature has been published on the aluminum-acetone heat pipe reliability. In this study, the aluminum-acetone flat plate heat pipe is examined at high temperature and long time to accelerate generation of non-condensable gases (NCGs).The objective of this study is to examine reliability of aluminum-acetone flat plate heat pipe and use the process to exhaust NCGs for water-aluminum produce. It will benefit to improve performance of aluminum-acetone heat pipe.
關鍵字
名稱Bifurcation Analysis of Trailing Edge Angle for Aeroelastic System
年度2012
類別研討會
摘要An aeroelastic system combines several complex theories of physics. These principles will cause instability situations or be interacted each other. If this behavior occurs, it will result in the fatigue problems or structural damages on the wings of aircrafts. In order to avoid these conditions to occur, this paper studies the nonlinear dynamic behaviors of aeroelastic system under specific operating conditions and employs differential transformation method (DTM) to decrease the calculation errors. Also, the bifurcation diagram, Poincare map, and power spectra are used to analyze the numerical results. The results reveal a complex dynamic behavior comprising periodic, sub-harmonic, and nonperiodic responses of the system. Especially, the nonperiodic motion occurs at the interval of ±180o for angle of trailing edge. The proposed method provides an effective means of gaining insights into the nonlinear dynamics of aeroelastic systems.
關鍵字Aeroelastic, Differential transformation method, Bifurcation diagram
名稱Optimization of the Micro Channel Heat Sink by Combing Genetic Algorithm with Finite Element Method
年度2012
類別研討會
摘要This paper presents an optimization design of micro channel heat sink. The three dimensional model of this heat sink with fluid flow cooling is investigated by numerical simulations. The optimization algorithm in this paper combines finite element method with genetic algorithm. The objective of this optimization design is improving the ability of heat dissipation for the micro channel heat sink. The design variables of this optimization design include the number of channel N, channel aspect ratio α and the ratio of channel width to pitch β. Moreover, this paper even considers the weight of this micro channel heat sink in the optimal design process. The results show that the heat dissipative ability can be improved, and the weight of this micro channel heat sink can be decreased, individually or simultaneously.
關鍵字
名稱壓電型熱管發電機之流場研究
年度2012
類別研討會
摘要近年來能源問題日益嚴重,如何尋找新的能源或能夠回收或獵取浪費之能源為許多研究者著重之課題。本研究為本年度國科會計畫「新型壓電熱管發電機之設計與製造」之研究成果,其目的為利用熱管中本已存在之蒸汽動能做為振動致電之能量來源。而其中之流場現象及熱傳沸騰現象更是熱管在不同工作溫度下所能產生電量之關鍵參數。熱管中液汽相轉換時,蒸汽通過熱管中設計之噴嘴以提高汽體流速以驅動壓電薄片振動而發電。本研究之目的為探討如何設計利用熱管內流體之流動為壓電型熱管發電機之動力來源,並探討其效率以進行實際運作。本研究於熱管中設計合適之噴嘴以提高汽體流速以驅動壓電薄片振動而達成發電之目的。研究中以實驗來探討其關係,將進行蒸汽驅動壓電片發電之實驗,以獲得熱管加熱功率及發電量間之關係。此結果可有效運用於壓電型熱管發電機之設計與製造上。
關鍵字熱管發電機、壓電、振動致電
名稱A Solution Processed ZnO Thin Film
年度2012
類別研討會
摘要The effect of Zinc-Oxide (ZnO) thin film annealed in different ambiences is presented. To achieve low cost and environmentally friendly process, ZnO aqueous solution is synthesized by dissolving zinc acetate dihydrate in deionized water directly. Zinc oxide aqueous solution of high solubility and stability is presented. High quality and dense Zinc oxide thin film is formed by spin coating. Annealing temperatures are in the range of 300 °C~500 °C, and annealing ambiences of both air and N2 are discussed.
關鍵字Thin Film Transistor, Thin Film Property, ZnO, Solution Process
名稱CMOS製程相容之樑結構應力模擬分析技術
年度2012
類別研討會
摘要This research provides a technique to predict the elastic deformation of a CMOS-MEMS bridge structure subjected to the mean stress and gradient stress. First, the stress boundaries are setting to obtain the equivalent mechanical model. And then using the commercial software ANSYS to simulate the deformation of a beam under stress conditions. The simulation results about the pre-deformation caused by residual stress agree well with experimental data. Therefore, an analytical method of a CMOS-MEMS bridge with residual stress is developed in this paper, which can be used to improve the reliability of the CMOS-MEMS structure.
關鍵字CMOS-MEMS bridge structure, mean stress, gradient stress
名稱氧化鋅薄膜性質在可撓表面聲波元件上之研究
年度2012
類別研討會
摘要近幾年來感測器蓬勃發展,表面聲波感測器已成為關注重點,由於表面聲波元件裝置有極少數被製造於可撓式基板,其將可促使表面聲波元件裝置應用更加多元化。本文研究可撓式表面聲波元件之氧化鋅薄膜性質,運用溶膠-凝膠法(Sol-Gel Method)調配氧化鋅(ZnO)溶液,並透過旋轉塗佈(Spin Coating)沉積氧化鋅薄膜,最後以X 光繞射儀(XRD)及掃描式電子顯微鏡(SEM)來觀察其薄膜的結晶晶相、材料性質及表面形態,藉此探討旋轉塗佈轉速對氧化鋅薄膜結晶之影響性,在未來利用結晶性良好之氧化鋅薄膜製造可撓式表面聲波元件。
關鍵字表面聲波感測器、氧化鋅薄膜、壓電材料、溶膠-凝膠法
名稱運用基因演算法於微流道散熱器之通道內連結之最佳化設計
年度2012
類別研討會
摘要近年來,隨著半導體技術蓬勃發展與成熟,電子產品不斷趨向小體積、高效能及高功率發展,並擴展應用至消費型電子和醫療系統等領域,因此微流道散熱器之使用也越來越普遍。本研究整合有限元素分析軟體與最佳化方法來進行微流道散熱器之最佳化設計,其使用之最佳化方法為基因演算法(Genetic Algorithm),有限元素方法則是運用商業套裝軟體COMSOL Multi-physics 來進行模擬及分析。本研究針對微流道散熱器之三維模型取兩通道之中連結長度、壓力分佈及溫度分佈進行探討,以最適合之幾何參數與散熱器之散熱效率為最佳化目標函數來進行最佳化設計。分析結果顯示,藉由改變不同連結長度幾何參數,可以找到有效設計之目標,並提高散熱性能。
關鍵字微流道散熱器、最佳化設計、基因演算法
名稱於實驗室尺度建置實驗系統及模擬探討CO2-EGS於儲集層之熱流現象
年度2013
類別研討會
摘要
關鍵字
名稱The Heat Exchanger of Heat Pipe Study for Ground Source Heat Pump
年度2013
類別研討會
摘要Nowadays, reducing the greenhouse gas emissions have become the common objective for countries around the world. This study presents an innovative heat exchanger of heat pipe for cooling system. By using the heat pipe for cooling air is the fundamental idea of this heat exchanger. The heat exchanger consists a heating blower to blow out hot air, a circulating cool water device, and a set of heat pipes. The results show that the temperature of air decreases apparently through the heat exchange. In addition the effects of the air velocity are discussed for the efficiency of this heat exchanger. The efficiency is better as the air velocity increases. Therefore, this innovative heat pipe exchanger is proofed through our experiment. This heat pipe Hx is suitable for the application of enhanced geothermal system (EGS).
關鍵字Heat pipe, Heat exchanger, Efficiency, EGS
名稱Mechanical response of hydrogen-filled single-walled carbon nanotubes under torsion
年度2013
類別研討會
摘要Molecular dynamics simulations are performed to investigate the torsional buckling behavior of single-walled carbon nanotubes (SWCNTs) filled with hydrogen gas. The simulation model accounts for both the mechanical deformation of the SWCNT and the interactions among the hydrogen and carbon atoms. It is found that the critical torsional moment and stiffness of the SWCNT are both significantly dependent on the hydrogen molecule storage density. Importantly, the change in torsional stiffness differs from that of conventional linear elastic materials as a result of the nonlinear oscillatory response due to nonlinear mechanical effects.It is shown that under large deformations, the SWCNT switches reversibly between different morphological patterns. Each change in pattern corresponds to an abrupt release of the strain energy and a singularity in the stress-strain curve. It is shown that at higher hydrogen storage densities, the hydrogen molecules exert a stabilizing effect on the SWCNT. The degree of torsional stability is determined principally by the distribution of the hydrogen molecules within the SWCNT. Finally, it is shown that the torsional deformation of the SWCNT is characterized by a stick-slip phenomenon.
關鍵字
名稱三乙醇胺於氧化鋅薄膜結晶改良之研究
年度2013
類別研討會
摘要本研究探討加入三乙醇胺對醋酸鋅的水解之結晶影響,運用溶膠-凝膠法(Sol-Gel Method)調配氧化鋅(ZnO)溶液過程中加入三乙醇胺(Triethylamine;TEA),並透過旋轉塗佈(Spin Coating)沉積氧化鋅薄膜,最後以X 光繞射儀(XRD)及掃描式電子顯微鏡(SEM)來觀察其薄膜的結晶晶相、材料性質及表面形態,藉此探討加入三乙醇胺對氧化鋅薄膜表面均勻與結晶之影響性,結果驗證了醋酸鋅的水解可影響薄膜表面均勻度與結晶性,此研究可製作出具高(002)方向的氧化鋅薄膜,未來可用於增強表面聲波元件之壓電性能。
關鍵字氧化鋅薄膜、三乙醇胺、溶膠-凝膠法
名稱二氧化碳於微型儲集層之熱流分析
年度2013
類別研討會
摘要利用地熱能源來替代化石燃料同時減少溫室效應所造成的問題為新一代的趨勢,而增強型地熱系統就是其中一個方法。因增強型地熱系統之工作流體主要為水,其受限於水資源豐富的地層,又因水的物理性質須要更多泵功導致取熱效益降低。本研究實驗方法是建立實驗室取熱系統,利用超臨界二氧化碳取代水為工作流體並注入空心測試段內探討不同壓力、流量以及溫度下超臨界二氧化碳之取熱效益,並與具有多孔介質之測試段比較取熱效益。由實驗結果可以看出流量增加會造成Nu和熱交換量提高,壓力在1500Psi時的Nu與熱交換量最大;在溫度150℃時Nu較大,但熱交換量小於200℃,這是因為二氧化碳的比熱隨著溫度改變的緣故,最後孔隙率對於Nu與熱交換量的影響不大。
關鍵字超臨界流體、EGS、二氧化碳
名稱NaAlH4金屬氫化物之卡匣式儲氫罐之熱傳分析與設計
年度2013
類別研討會
摘要本研究利用NaAlH4吸放氫化學反應動力方程式建立一個鋁系金屬儲氫材料之卡匣式儲氫罐。透過固態熱傳理論與金屬粉體等效熱傳導係數的物理模型的分析,完成鋁系金屬儲氫材料在不同溫度與壓力下,儲氫系統之氫氣吸附的動力曲線。在了解鋁系金屬儲氫材料吸放氫特性與反應熱的關係、材料氫化的動力特性與系統充氫的時間(refueling time),定義出屬於應用端需求的氫化物總量、系統吸氫與放氫的最佳壓力及溫度條件。最後針對氫氣應用端需求的氫氣流率回饋相關數據,進行儲氫罐導熱能力的基本設計。
關鍵字金屬氫化物、儲氫罐設計、熱傳分析
名稱超臨界二氧化碳於多孔介質中取熱之模擬
年度2013
類別研討會
摘要為了瞭解超臨界二氧化碳在高溫高壓儲集層內熱傳遞及取熱之性能。本研究採用有限元素模擬軟體進行小型超臨界二氧化碳取熱模型之建立,其中藕和達西定律及熱傳模組模擬超臨界二氧化碳在多孔隙介質中流動與取熱之情形,並假設多孔介質為等向性及均質,流體在多孔介質內為飽和狀態。本文針對不同入口流速及不同的多孔介質孔隙率進行比較,結果發現入口流速增加出口溫度降低,而在入口流速較大時孔隙率的影響就越大。
關鍵字超臨界流體、多孔介質、二氧化碳
名稱The Improvement of Parameters of Manufacturing Process on Flexible Surface Acoustic Wave Device
年度2013
類別研討會
摘要This study issues the improvement of the parameters of manufacturing on the flexible SAW device. The better piezoelectric characteristics of ZnO film will be obtained. The Sol-Gel method is used to prepare the ZnO solution and deposits ZnO film by spin coating process. X-ray diffraction (XRD) and scanning electron microscope (SEM) are used to get the crystalline property. The results reveal that ZnO film possesses better crystalline property in 400RPM of spin speed. The piezoelectric intensity of (002) direction is 1566.67 (a.u.) and atomic morphology of ZnO film are exhibited by SEM image. This better ZnO film will enhance the wave propagation of surface acoustic wave (SAW) device. It can also expand the application of SAW device.
關鍵字SAW sensor, ZnO film, Piezoelectric material, Sol-Gel method
名稱The Study of the Enhancement of Micro-Vibration-Induced Harvester based on Vapor Impacting
年度2013
類別研討會
摘要With technology rapidly advance, the energy of demand is also with the greatly increased. Therefore, the development of new energy or energy harvesting attracts much attention. Our group has proposed an innovated micro heat pipe harvester based on the micro-piezoelectric vibration-induced power device. The deformation of the piezoelectric material by vapors impacting enables it to convert the vapor momentum to the power. In this paper, the purpose is to enhance the output of the micro heat pipe generator by the optimization of the vibration-induced device. A suitable cantilever beam combined with piezoelectric material is designed by multiphysics and genetic algorithm. The optimal geometry is found to approach its natural frequency. The experimental results show that the power improves about 293.38%. Through this study, the micro heat pipe generator will be practiced and approach the available usage.
關鍵字energy harvester; cantilever beam; resonance; natural frequency
名稱Optimization of the Micro Channel Ladder Shape Heat Sink
年度2013
類別研討會
摘要The channel heat sink is in contact with the working fluid to remove the heat. But much channel will result higher pressure difference issue in the micro multi-channel heat sink. In this paper, a ladder shape channel (link between the parallel channel) is proposed to correct the problem of high pressure difference. The design of the link decreases the pressure difference for reducing the pump work of the micro multichannel heat sink. The purpose of this paper is to maximize the efficiency of the micro multi-channel ladder shape heat sink by using optimization design. An optimization method based on the genetic algorithm and COMSOL 3-D conjugated thermal-fluid model is applied to establish the optimal geometry parameters of the link. The results show that this optimized heat sink design can improve the efficiency more than 43%. And the heat removal of the proposed device is significantly improved.
關鍵字micro channel heat sink; ladder shape; optimization; genetic algorithm
名稱The Design of Heat Pipe Heat Exchanger for CO2 EGS
年度2013
類別研討會
摘要The findings of new energy and energy harvester are the important issues for the lacking of fossil energy. For the purpose of the effective usage of supercritical CO2 flowed from the product well of CO2 EGS (Enhanced Geothermal System), an innovative heat pipe heat exchanger (Hx) is designed and practiced in this study. This study presents an innovative Hx of heat pipe for extracting the heat from CO2 or warm gas. By using the heat pipe for cooling gas is the fundamental idea of this Hx. The experimental apparatus of Hx consists a heating blower to blow out hot gas, a circulating cool water device, and a set of heat pipes. The efficiency of Hx is approved as the increasing air velocity and the more fins gradually. This innovative heat pipe exchanger is proofed through our experiment. This heat pipe Hx is suitable for the application of enhanced geothermal system (EGS) and more energy harvesting application.
關鍵字Heat pipe, Heat exchanger, Efficiency, EGS
名稱The Study of the Performance of the Acetone and Aluminum Flat Plate Heat Pipe
年度2013
類別研討會
摘要The flat plate heat pipe (FPHP) made of aluminum with a copper-coated surface, for filling acetone, is investigated by experiment. Performance indicators, such as temperature uniformity, thermal resistance and maximum heat transport are measured on the varying filling amounts of working fluid. After 2000 h of compatibility test, the results show that the generated rate of non-condensable gas (NCG) for a 1.4 g filling amount is larger than the one of 1.7 g. After that, The NCG exhausted process is operated after this 2000 h, then continued for an additional 2000 h compatibility test. Finally, it can proof that the FPHP is available under the compatibility between the aluminum and acetone.
關鍵字Flat Plate Heat pipe, Aluminum, Non-condensable gas
名稱Development of An Novel Adaptive Suspension System based on Ball-screw Mechanism
年度2013
類別研討會
摘要For the passive and semi-active suspensions are characterized as with constant parameters which cannot cope with time-variant road conditions, the suspension results are difficult to be satisfied. Although, the active ones are better than previous two on suspension performance, until now which are still far from real application for the drawbacks of complicated structure, large volume, costly, and difficult maintenance. Here, Ball Screw (BS) is with the characteristics of smaller volume, precise positioning, and well handling high-speed forward and backward transmissions. Instead of hydraulic or pneumatic mechanisms used for vehicle suspension, BS is adopted to be the main body of the proposed New Adaptive Suspension System (NASS). Besides, in order to overcome the unavoidable time-delay resulted from mechanical or computational operations, the Kalman filter, integrated with suspension controller, is used to estimate the road conditions. The effectiveness and feasibility of this proposal are confirmed through simulation studies.
關鍵字Adaptive Suspension, Ball Screw, Kalman Filter.
名稱應用板式鋁-丙酮熱管之高功率LED散熱模組研究
年度2014
類別研討會
摘要尋求各種冷卻模組之設計,以紓緩高功率LED過熱問題,為目前研發上亟為重要之課題。本文將探討一種自行開發之板式鋁-丙酮熱管為冷卻模組之被動式高功率LED冷卻模組之移熱效率,板式鋁-丙酮熱管在其穩定及適於中溫操作之機制具有極佳之發展潛力。本文對比同樣LED陣列在無冷卻模組與應用板式鋁-丙酮熱管之高功率LED冷卻模組的工作狀態,並對其進行模擬計算,並探討其於高功率LED上之工作效率以進行實際之運作。首先將LED佈置於銅基板,利用熱電偶測量LED接點溫度得出無散熱模組時之溫度分布,然後利用板式鋁-丙酮熱管建立冷卻模組,將LED熱源以同樣的模式置於其表面,再次測量溫度分布。以此建立不同功率下LED陣列在有無散熱模組的接點溫度狀況,對比其結果計算熱移除量。繼而利用多重物理量模擬軟體,建立相應的理論模型進行熱傳分析,將實驗數據與模擬結果進行比較以相互驗證並掌握誤差,利用模擬與實驗相結合來得出鋁丙酮熱管在高功率LED散熱模組中的熱移除能力。未來將利用模擬結果進行該冷卻模組之最佳化設計。本文所提之設計將可有效於高功率電子元件進行散熱,亦可有效且廣泛應用於系統之節能設計上。
關鍵字高功率LED冷卻模組鋁-丙酮熱管
名稱The Fabrication of Flexible Double Cell Split Ring Resonator based on Fully Ink Jet Printing Technology
年度2014
類別研討會
摘要—This study designs and fabricates an double cell split ring resonator with the properties of metamaterials by the fully ink-jet printing technology and COMSOL package. The pattern made of nano silver is printed on the flexible polyimide (PI) substrate. Sparameters of this resonator are obtained from the vector network analyzer. The frequency band of the split ring resonator responses in 5.5-6 GHz. It can be converted to obtain the permittivity and magnetic permeability. The fully ink-jet printing technology proposed in this study is robust and cheaper than the MEMS process. Through this fabricated process, the fabrication of metamaterials will become robust and faster. In addition, we expect that this fabricated method can be expanded to the most of manufactured process of film devices, such as SAW devices, transparency film, and metamaterials.
關鍵字Metamaterials; double cell split-ring resonator ; Sparameter
名稱The Effect of Graphene Growth on Impurities Catalyst Substrates
年度2014
類別研討會
摘要The study investigates the graphene growth on four types of industrial copper ribbons. The graphene is synthesized by low pressure chemical vapor deposition. Both of the Argon and (CH4/H2) mixture are the precursors for deposition time. The surface morphology and grain growth behavior of these films are studied by SEM and OM observation. Impurities on the Cu substrate behave as the nucleation sites in the formation of carbon cluster on Cu surface. The graphene morphologies on these 4 types substrates are constituted by carbon discs in the range of 1~20 μm. Fractal geometry has been observed to study a variety of irregular films within a jigsaw of the variance grain structures. Current results verify the effect of surface impurities on the resulting graphene thin film. We suggest that a higher Cu purity substrate supports formation of larger graphene grain size.
關鍵字graphene, LPCVD, surface impurities
名稱以表面聲波元件為基礎之可撓二氧化碳感測器
年度2014
類別研討會
摘要本研究探討利用表面聲波元件為基礎製造出一個行動可撓之薄膜二氧化碳感測器。首先運用溶膠-凝膠法(Sol-Gel Method)調製出氧化鋅(ZnO) 溶液並利用旋轉塗佈(SpinCoating)製程進行沉積氧化鋅薄膜並加上三 乙醇胺使薄膜更為強健,繼而利用直接噴墨印表技術以奈米銀製作電極,最後再將三乙醇胺以固定的量均勻地塗抹在氧化鋅薄膜最上方作為感測層,而完成此感測器之製作。本研究利用向量網路分析儀(Vector Network Analyzer)量測二氧化碳感測器之頻率響應,結果證明有明顯的感應現象導致訊號偏移。此二氧化碳感測器具有輕薄可攜及可撓之特點,未來將改進製程參數以強化頻率偏移量使增強感測效果。
關鍵字二氧化碳感測器、氧化鋅薄膜、溶 膠-凝膠法
名稱以Brinkman模型探討超臨界二氧化碳於增強型地熱系統儲集層之熱傳現象
年度2014
類別研討會
摘要本文是探討超臨界二氧化碳於增強型地熱系統儲集層之熱傳現象,結合暫態熱傳模型與Brinkman模型並透過有限元素法以估算多孔介質中的流動和熱傳特性,並對儲集層中不同的壓力及入口體積流率進行討論。結果顯示不同的入口體積流率導致在出口壁面和工作流體的溫度差明顯不同,可以預見的是隨著體積流率下降,取熱量會增加。此外,因為超臨界二氧化碳的特性,將會在適當的操作壓力下達到最大取熱值。
關鍵字
名稱Effects of Copper Substrate Compounds on Graphene Growth
年度2014
類別研討會
摘要In this research, we investigate the graphene growth on four types of copper ribbon. The graphene thin film synthesized by low pressure chemical vapor deposition (LPCVD)method. Both of the Argon and (CH4/H2) mixture are the precursors for different deposition time in a range 5~30min. The surface morphology and grain growth behavior of these films were studied by optical microscopy associated with bright and dark filed observation. Impurities on the Cu substrate behaved as the nucleation sites in the formation of carbon cluster on Cu surface. The morphology for these for types substrates is constituted by carbon disc in the range of 1~100 micrometer. Fractal geometry has been observed to study a variety of irregular films within a jigsaw of the variance grain structures. Based on these results, we suggest that the growth of graphene thin films can be described by the fractal dynamics. The distribution of the surface impurities enhances grain structure homogeneous of the graphene film.
關鍵字graphene, LPCVD, fractal dynamics
名稱Experiment of the Porous Heat Extraction of Supercritical CO2
年度2014
類別研討會
摘要The heat transfer phenomena of supercritical carbon dioxide are experimentally investigated in a vertical tube for improving the efficiency of CO2-EGS. The experiment is conducted for the various flow rate and the initial wall temperature. The results show that the heat transfer coefficient with porous media increases as the flow rate increases. Moreover, the excellent performance is exhibited at 1500 psi because of the effects of inlet temperature. In addition, the effects of the porosity and the initial wall temperature are weak through these results. This study will provide the effective data for regarding the operating conditions of the enhanced geothermal system.
關鍵字Geothermal, enhanced geothermal system (EGS), supercritical, carbon dioxide (CO2)
名稱Investigation of Heat Extraction from Heated Porous Media in Supercritical CO2-EGS
年度2014
類別研討會
摘要The purpose of this study is to obtain the heat extraction of the supercritical CO2 in the reservoir for the enhanced geothermal system (EGS). The heat transfer model conjugated with the Darcy’s law employed by the finite element package is used to evaluate the thermal behavior in the porous medium. The influence of heat extraction on different inlet velocity and various porous porosity is studied. The simulation results show that the inlet velocity is the major parameter for the heat extraction. The temperature of exit decreases as the inlet velocity increases apparently. It means that the heat extraction will increase as the velocity decreases. However, the effect of porous porosity should also be considered since the heat transfer area will be influenced by different porosity. The effects of larger heat transfer area and slower flow will increases the heat extraction effectively.
關鍵字heat extraction; geothermal; supercritical; porosity
名稱Investigation of Thermal Phenomena in the Reservoir of Supercritical CO2-EGS base on Brinkman Model
年度2014
類別研討會
摘要The purpose of this study is to obtain the heat extraction of the supercritical CO2 in the reservoir for the enhanced geothermal system (EGS). The heat transfer model conjugated with the Brinkman’s law employed by the finite element package is used to obtain the thermal behavior in the porous medium. The different pressure of the reservoir, the various inlet volumetric flow rate are discussed. The simulation results show that the temperature difference between the wall and working fluid at the outlet is strongly influenced by the inlet volumetric flow rate, which is, the heat extraction will increase as the volumetric flow rate decreases. However, the maximum heat extraction can be obtained under the appropriate reservoir pressure due to the particular property of supercritical CO2.
關鍵字Enhanced Geothermal System (EGS) , Supercritical CO2 , Porous media
名稱Parametric Analysis of Electromagnetic Waves Shielding of Metamaterial Structures
年度2014
類別研討會
摘要“Metamaterial” is a unique material which has negative permittivity and negative magnetic permeability as well [1-3], and by embedding microscalemetallic structures in dielectric materials, it features shielding effect. In this study, a three-dimensional numerical model of the electromagnetic wave shielding effect of a metamaterial structure is developed based on framework of a commercial computer package. The metamaterial layer includes a layer of periodic metallic pattern and a layer of dielectric material. It is used as a frequency selective surface which can achieve nearly perfect shield in terahertz regime. In addition, effects of geometric parameters with the structure of the metamaterial layers on shielding of incident electromagnetic wave are predicted for different patterns and geometries. In the analysis, results show if cell size, pattern size or gap size of the pattern is increased, the frequency selective range of shielding is increased. The predicted frequency selective range is found to be independent of the solution domain. For a silver pattern of 0.5-mm width, the shielding ratio of typical peak attenuation is 34% at 4.2 GHz.
關鍵字metamaterial; parametric analysis; numerical simulation; electromagnetic wave
名稱The Design of Flexible CO2 Sensor based on the SAW Device
年度2014
類別研討會
摘要BSTRACT This study designs and fabricates an innovative flexible CO2 sensor based on the SAW device. The flexible sensor is composed of a ZnO layer sandwiched in between a flexible sheet, IDT electrode layer, and top sensor layer [1]. The sol-gel method and spin coating are used on the ZnO thin film. In advance, addition of Triethanolamine promotes the robust of ZnO film. The IDT of the top electrode layer is nano silver by inkjet printing technology [2]. Inkjet printing process possesses the advantages of direct patterning and low-cost. It does not require MEMS processes since the pattern is directly printed on the flexible PI sheet [3]. Finally, Triethanolamine film is done by spin coating as the sensor layer. The center operating frequency of this SAW CO2 sensor is measured by the vector network analyzer. The results prove that the significant deviation of frequency resulted from the absorption of CO2 is observed. The characteristics of this CO2 sensor is thin, portable and flexible. The improvement of fabricated parameters will enhance the effect of sensing of this saw CO2 sensor in future.
關鍵字CO2 sensor、ZnO film、Sol-gel method
名稱The Study of the Cooling Module based on the Aluminum-Acetone Flat Plate Heat Pipe of High Power LED
年度2014
類別研討會
摘要The power of LED increases very fast and the application of LED is more widely as the technology growing. The advantages of LED are small size, long lifetime, fast response, high lighting efficiency, anti-impact and colorful. The most important issue of the LED research still is to find a potential design of heat removal and solve the problem of LED over-heating. The purpose of this study is to design the LEDs combined with the cooling module of the aluminum-acetone flat plate heat pipe by the experiment and numerical simulation for the high efficiency of heat removal. The optimization of LED package is done by our team [1] for the optimal heat removal of LED chip. In 2011, the optimal arrangement of LED array is proposed for avoiding the high concentration of the power density [2]. The innovative aluminum-acetone flat plate heat pipe is proposed and fabricated by our team [3]. The heat pipe which transfer the heat by phase transition is suit for the working temperature of LED. The efficiency of this cooling module is discussed by the experiment and simulation for the realistic application. This cooling module can be used for heat removing of the high power electronic unit. Also, it can be used for the energy-saving engineering.
關鍵字heat transfer; high power LED ; aluminum-acetone heat pipe
名稱Wave Evolution On Roll Coating Flows Of Thin Macromolecular Liquid Films
年度2014
類別研討會
摘要Lubricating processes, surface roll and spin coatings of a moving rotation substrate by a liquid layer are of importance in a variety of industrial application. In practice, coating liquids often contain Non-Newtonian pseudoplastic macromolecular liquids. This is somewhat complicated than that of the Newtonian flow. In industry applications, the quality of the final product is largely dependent on the hydrodynamic stability of the liquid film as it flows over the substrate. Flow governing equation on roll coating is solved on an order-by-order basis by the long-wave perturbation method. Normal mode method is used to analyze the flow regime and categorize the regions where the threshold amplitude exists in the linear stability. The viscosity of the macromolecular fluid appears to be lower in the higher shear rate part of the experiment. When coating a moving substrate with a thin liquid film, even macroscopic instabilities of the film system can result in a non-homogenous film growth. The result shows the Newtonian fluid tends to stabilize the thin-film system than that of pseudoplastic macromolecular fluid.
關鍵字macromolecular liquid; Norrmal mode method; roll coating
名稱The Thermal Phenomena of the Supercritical CO2 in the Reservoir of the Enhanced Geothermal System based on Brinkman Model
年度2014
類別研討會
摘要The paper is to discuss the thermal phenomena of the supercritical CO2 in the geothermal reservoir for the enhanced geothermal system. The transient heat transfer model conjugated with the Brinkman model of employed by the finite element package is used to obtain the dynamic and thermal behavior in the porous medium. The different pressure of the reservoir, the various inlet volumetric flow rate are discussed. The results show that the inlet volumetric flow rate results in the temperature difference between the wall and working fluid on the exit apparently. It can be predicted that the heat extraction will increase as the volumetric flow rate decreases. In addition, the suitable operated pressure will reach the maximum heat extraction for the reason of property of supercritical CO2.
關鍵字
名稱Design of the Cooling Module of LEDs based on the Aluminum-Acetone Flat Plate Heat Pipe
年度2014
類別研討會
摘要The waste heat generated by high power LEDs is hardly effectively dissipated, therefore, it results in a serious problem in the luminous efficiency. The most important issue of the LED research is to find a potential design of heat removal and solve the problem of LED over-heating. The purpose of this study is to design the LEDs combined with the cooling module of the aluminum-acetone flat plate heat pipe by the experiment for the high efficiency of heat removal. The aluminum-acetone flat plate heat pipe is innovative proposed by our team. The high power LEDs with and without heat pipe cooling module is compared. The heat removal efficiency of the cooling module of the aluminum-acetone flat plate heat pipe reaches 77% and drops the junction temperature of LED about 36 °C. The cooling module of the aluminum-acetone flat plate heat pipe has proven to be effective in solving the heat concentration problems associated with the LED chips. In short, the phase change cooling module will apply on the electronic component of high heat concentration for more effective cooling method.
關鍵字LEDs, heat removal, aluminum-acetone flat plate heat pipe, cooling module.
名稱Impurity Influence of Graphene Growth on Cu Ribbon
年度2014
類別研討會
摘要For electronic applications, synthesis of large area, single layer grapheme with high crystallinity is required. One of the most promising and widely applied methods is chemical vapor deposition (CVD) using Cu thin film as catalysis. Howerer, the CVD grapheme is generally polycrystalline and contains a great many grain boundaries and defects. The microstructure defects occurr when the catalysis surface contains the impurities’. Grain boundary and defect limit intrinsic physical properties of graphene. In this perspective, we discuss the growth mechanism of grapheme on a Cu foil associate with different Cu purities in a range 90% to 98%. We give a comparison of the Cu catalysis film impurity effect by the observation of the domain structure of graphene. Finally, we emphasize the importance of the growth condition and impurity of the Cu catalysis for the realization of single crystalline graphene.
關鍵字
名稱The Heat Extraction Investigation of Supercritical Carbon Dioxide Flow in Heated Porous Media
年度2014
類別研討會
摘要The purpose of this study is to obtain the heat extraction of the supercritical CO2 in the reservoir for the EGS. The heat transfer model conjugated with the Darcy’s law employed by the finite element package is used to obtain the thermal behavior in the porous medium. The sensitivity parameter study under the various inlet velocities and porosities of the porous medium are discussed. The results show that the inlet velocity is the most important effect for the heat extraction. The temperature of exit decreases as the inlet velocity increases apparently. It means that the heat extraction will increase as the velocity decreases. However, it is evident gradually as the porosity decreases. This study can enhance the heat extraction and reduce the cost of realistic test of enhanced geothermal system.
關鍵字
名稱Experimental Study of the Heat Transfer of Supercritical Carbon Dioxide in Silica-based Porous Media
年度2014
類別研討會
摘要The heat transfer phenomena of supercritical carbon dioxide are experimentally investigated in a vertical tube with silica-based porous media. The experiment is conducted for the various static pressure, the flow rate, the initial wall temperature, and nonporous or porous media. The results show that the heat transfer coefficient with porous media increases as the flow rate increases. Moreover, the excellent performance is exhibited at 10 MPa because of the effects of inlet temperature. In addition, the effects of the porosity and the initial wall temperature are weak through these results. This study will provide the effective data for regarding the operating conditions of the enhanced geothermal system.
關鍵字
名稱Experimental Study of Heat Transfer of Supercritical Carbon Dioxide
年度2014
類別研討會
摘要In this study heat transfer of supercritical carbon dioxide in vertical tube with 10 mm of inner diameter and 1800mm of length was investigated experimentally. The initial temperature of tube wall was set to 150 and 200℃. The system pressures of supercritical carbon dioxide are 1100, 1500 and 2000 psi, respectively. The experimental results show that the heat transfer coefficient and heat transfer rate increase with Reynolds number. The maximum heat transfer coefficient and heat transfer rate was occurred in 1500 psi of system pressure. The heat transfer coefficient for 150℃ is higher than that of 200℃ resulted from effect of specific heat.
關鍵字Supercritical fluid, Enhanced Geothermal System (EGS), Carbon dioxide
名稱The Parametric Design of the Fabrication on the Flexible Surface Acoustic Wave Device
年度2014
類別研討會
摘要The flexible surface acoustic wave (SAW) device is a promising product for the expanded application of SAW device. The purpose of this study is to obtain the better output gain of the flexible SAW device. The parametric modification on the fabrication of the flexible surface acoustic wave devices is processed. The ZnO solution is prepared by sol?gel technology. We design inter digital transducer (IDT) pattern and deposit ZnO solution on the flexible polyimide plastic (PI) substrate by inkjet printing process. Next, the frequency of SAW device is measured by the vector network analyzer. The effect of the thickness of ZnO film and IDT will be studied in this paper. The piezoelectricity of the film increases as the thickness of the film increases. The output gain is better as the thickness of the IDT is 500μm. This study can improve the efficiency of the SAW device and expand the application of the SAW in future.
關鍵字SAW, ZnO, Sol?Gel method, Inkjet printing
名稱The Electromechanical Behavior of a Micro-Beam Driven by Traveling Electrostatic Force
年度2014
類別研討會
摘要There is no literature mentioning the electromechanical behavior of a micro-beam, one of the common microstructure in micro devices, driven by traveling electrostatic forces. This paper is to present the dynamics and stabilities of a micro-beam on which an electrostatic force travels to and fro. The traveling electrostatic force may be induced by a row of actuated electrodes which are arranged beneath the micro-beam and actuated sequentially. The linearized distributed model considering the electromechanical coupling effect between electrostatic force and structure is derived based on the small deflection assumption. According to the analytical results, the micro-beam will resonate when the traveling speeds of the electrostatic force approach some critical speeds. The critical speeds are equal to the ratio of the natural frequencies to the wave number of the correlative natural mode of the micro-beam. Besides, the micro-beam may be unstable at some traveling speeds differing from the critical speeds. Furthermore the unstable regions expand with increasing driving voltage. This article may lead to a new research branch on electrostatic-driven micro devices.
關鍵字electrostatics, MEMS, microstructures, stabilities
名稱Fabrication of ZnO Thin Film Sensor for CO2 Monitoring
年度2015
類別研討會
摘要The flexible carbon dioxide sensor is a prospective technology for the extensive application of oSAW device. The purpose of this study is to optimize the crystallization of ZnO film for a carbon dioxide sensor by sol-gel technology and inkjet technology. The flexible CO2 sensor composes of a ZnO layer sandwiched in between a flexible sheet, IDT electrode layer, and top sensor layer. The ZnO thin film uses the sol-gel method and spin coating. Triethanolamine adds into ZnO solution to promote the robust of ZnO film. The IDT of the top electrode layer is nano silver by inkjet printing technology. Finally, Triethanolamine film is coated as the CO2 sensor layer. The center operating frequency of this SAW CO2 sensor is measured by the vector network analyzer. The results prove that the significant deviation of frequency resulted from the absorption of CO2 is observed. The characteristics of this CO2 sensor is thin, portable and flexible. The improvement of fabricated parameters will enhance the effect of sensing of this saw CO2 sensor in future.
關鍵字ZnO thin film, sol-gel method, CO2 sensor, inkjet printing
名稱Graphene Growth on Different Industrial Copper Ribbons by Chemical Vapor Deposition
年度2015
類別研討會
摘要In our study is investigates the graphene growth on few industrial copper ribbons. The graphene is synthesized by low pressure chemical vapor deposition. Both of the Argon and (Methane/Hydrogen) mixture are the precursors for deposition time. The surface morphology and grain growth behavior of these films are studied by SEM, AFM and OM observation. Impurities on the Cu substrate behave as the nucleation sites in the formation of carbon cluster on Cu surface. The graphene morphologies on these 4 types substrates are constituted by carbon discs in the range of 1~20 μm. Fractal geometry has been observed to study a variety of irregular films within a jigsaw of the variance grain structures. Current results verify the effect of surface impurities on the resulting graphene thin film. We suggest that a higher Cu purity substrate supports formation of larger graphene grain size.
關鍵字Graphene, LPCVD, Industrial Copper
名稱Heat Transfer Characteristics of Supercritical Carbon Dioxide in a Horizontal Tube
年度2015
類別研討會
摘要The convection heat transfer characteristics of supercritical CO2 in a horizontal tube were investigated experimentally. The experimental parameters were supercritical pressures and volumetric flow rates. The experimental results show that the heat transfer coefficient increased with flow rate. Furthermore, the pseudo-critical point had a significant influence on the heat transfer coefficient. In the study, the supercritical pressure of 10MPaconstituted an optimal operating condition for CO2-EGS because of the high heat transfer performance at 200 ℃.
關鍵字Supercritical fluid, Enhanced Geothermal System (EGS), Carbon dioxide
名稱Thermal Analysis of Aluminum-Acetone Flat Plate Heat Pipe Application in Heat Dissipation of High Power LEDs
年度2015
類別研討會
摘要The energy resources of nature are limited. According to the report from the International Energy Agency (IEA), there is 19% of the energy used for illumination. Its well known that LED is an excellent choice to instead the incandescent lamp for saving energy. But the other question comes out while the high power LED is applied. There is only about 20% of the input power converts to light energy, the rest of power is convers to heat which should be carry out from the LED chips, otherwise, the high heat concentration results in a serious problem to decrease LED working. The most important issue of the LED research is to find a potential design of heat removal and solve the problem of LED over-heating. The purpose of this study is to discuss the heat removal ability of the aluminum-acetone flat plate heat pipe by applying in the high power LED array. The aluminum-acetone flat plate heat pipe is innovative proposed by our team. The high power LEDs with and without heat pipe cooling module is compared. The heat removal efficiency of the cooling module of the aluminum-acetone flat plate heat pipe reaches 92.09% and drops the junction temperature of LED about 36 °C. The thermal resistance is discussed. The cooling module of the aluminum-acetone flat plate heat pipe has proven to be effective in solving the heat concentration problems associated with the LED chips. In short, the phase change cooling module will apply on the electronic component of high heat concentration for more effective cooling method.
關鍵字Aluminum-acetone flat plate heat pipe; high power LEDs; thermal analysis
名稱The Heat Extraction of SCCO2 in the Reservoir of EGS
年度2015
類別研討會
摘要This purpose of this study is to investigate the heat extraction of the supercritical CO2 in the geothermal reservoir for the enhanced geothermal system. The transient heat transfer model conjugated with the model of Brinkman equation employed by the finite element package is used. The sensitivity parameter study under the various applied heat flux, porosity and pressure are done. The dynamic and thermal phenomena in the porous medium are obtained. The effects of lower pressure and higher applied heat flux will increases the heat extraction effectively. It represents that the better heat extraction will be obtained if we can combine the suitable operating conditions. Therefore, it exists an optimal condition in the applied heat flux and pressure. In addition, we observe clearly that the heat extraction decreases as the porosity increases slightly. It still illustrates that the porosity will affect the heat extraction even it is minor. This study can enhance the heat extraction and reduce the cost of realistic test of enhanced geothermal system.
關鍵字Supercritical CO2, EGS, Heat Extraction
名稱顏維謀,林大偉,1997,單晶之VCD薄膜和熔化成長法製程的不穩定熱流與使其穩定之研究(Ⅱ)之子計畫五:垂直Bridgman單晶熔化成長法製程中的流體運動及熱傳之實驗研究(Ⅱ),國科會報告NSC85-2212-E-211-005。
年度1997
類別技術報告
摘要 
關鍵字 
名稱顏維謀,林大偉,1998,單晶之VCD薄膜和熔化成長法製程的不穩定熱流與使其穩定之研究(Ⅲ)之子計畫五:垂直Bridgman單晶熔化成長法製程中的流體運動及熱傳之實驗研究(Ⅲ),國科會報告NSC87-2212-E-211-006。
年度1998
類別技術報告
摘要 
關鍵字 
名稱陳朝光,林大偉,2002,分子動力學於微容器內自然對流熱傳現象之研究,國科會報告NSC90-2212-E-006-119。
年度2002
類別技術報告
摘要 
關鍵字 
名稱林大偉,李弘毅,陳冠穎,2002,奈米工程導論,教育部大學生跨領域科技能力培養研究計畫-微/奈米光機電跨領域研究計畫授課講義。
年度2002
類別技術報告
摘要 
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名稱林大偉,湯同達,李弘毅,2003,分子動力學,教育部大學生跨領域科技能力培養研究計畫-微/奈米光機電跨領域研究計畫授課講義,92年。
年度2003
類別技術報告
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名稱林大偉,2006,奈米殼層之放熱過程於氨基酸中之熱傳分析,國科會報告NSC95-2212-E-269-017。
年度2006
類別技術報告
摘要 
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名稱林大偉,2007,鋁製板式熱管之逆運算分析,工研院計畫結案報告。
年度2007
類別技術報告
摘要 
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名稱林大偉,2007,分子動力學於直接甲醇燃料電池之甲醇穿透率模擬,國科會報告NSC95-2221-E-269-025。
年度2007
類別技術報告
摘要 
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名稱林大偉,2007,藻類特用化學品試量產技術研發計畫-養殖槽熱傳分析,人宇生物科技股份有限公司政府補助計畫案。
年度2007
類別技術報告
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名稱林大偉,2008,直接甲醇燃料電池於甲醇穿透率之動態模擬與實驗,國科會報告NSC96-2221-E-269-007。
年度2008
類別技術報告
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名稱林大偉,2008,霧化型均熱板之評估分析,工研院計畫結案報告。
年度2008
類別技術報告
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名稱林大偉,2009,以平行分子動力學結合新表列法則於三維流道內蛋白質流體之熱流性質分析,98年度台南大學校內計畫結案報告。
年度2009
類別技術報告
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