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研究生： 陳榮舜
Chen, Jung-Shun
論文名稱： 平板式熱管熱傳特性之研究
Heat transfer characteristics of flat plate heat pipe
指導教授： 周榮華
Chou, Jung-Hua
學位類別： 博士
Doctor
系所名稱： 工學院 - 工程科學系
Department of Engineering Science
論文出版年： 2015
畢業學年度： 103
語文別： 英文
論文頁數： 86
中文關鍵詞： 平板熱管 、最大熱傳量 、熱傳導率 、液體填充率 、長度影響 、彎曲角度 、傾斜角度
外文關鍵詞： Flat plate heat pipe, maximum heat transport capability, effective thermal conductivity, liquid filling ratio, length effect, bending angle, tilting angle
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    • 本研究為平板熱管（FPHPs）熱傳特性之研究。探討4種參數對平板熱管熱傳特性之影響，分別為液體填充率、長度、彎曲、及傾斜角度。研究結果顯示，在FPHPs之液體填充率影響上，其長度在80 mm, 150 mm, 200 mm,與300 mm情況下，最佳液態填充率分別為20.1%, 24.8%, 31.4%,與35.1%。而FPHPs長度的影響，採用四個長度為80mm, 150mm, 200mm, 300mm的測試。結果為長度增加，最小熱阻Rth(min)增加，而最大有效導熱係數Keff(max)與的最大熱傳量Qmax均下降。長度從80mm增加至150mm，至200mm，至300mm，Rth(min)從80mm增加的比例分別為2.4, 6.0, 至17.9；80mm的最小熱阻Rth(min)約為0.103 K/W。長度從80mm增加至150mm，其最大熱傳量Qmax從109.5W迅速下降至49.6W（約0.452倍），長度增加至300mm其最大熱傳量Qmax慢慢降低到35W（約0.318倍）。而FPHPs彎曲的影響，彎曲角度分別為0°, 30°, 60°, 90°。結果為彎曲角度增加，熱阻Rth(min)減小。彎曲角度0°時之最小熱阻Rth(min)是0.6207 K/W，彎曲角度90°時之最小熱阻Rth(min)是0.1885K/W, 減少約3.3倍。有效導熱率從1933.4 W/mK增加至6365.6 W/mK。而最大熱傳量增大（從45 W至85 W）。就FPHPs之傾斜角度的影響而言，傾斜角度增大，熱阻降低，有效熱導率增加。傾斜角從0°增加到45°和90°時，最大有效熱導率分別從4561 W/mK增至5497 W/mK (增加1.205倍)，及至5530 W/mK(增加1.212倍)；最大熱傳量從39.8W增至115 W(增加2.89倍), 及至130 W(增加3.27倍)。因此採用短的FPHPs，適當的彎曲與適當的傾斜，FPHPs的冷卻增強性能可以被提高。

    The purpose of this study was to explore the heat transfer characteristics of flat plate heat pipes (FPHPs). The four parameters examined in this study were the liquid filling ratios, length, bending angles, and tilting; their effects on the heat transfer characteristics were examined experimentally. All the FPHPs were made of Al 6061 FPHPs which were filled with acetone (99.87% pure). The results showed that optimum liquid filling ratios Fr exhibited by the effective thermal resistance Rth(min) were 20.1%, 24.8%, 31.4%, and 35.1% for the length of 80 mm, 150 mm, 200 mm, and 300 mm, respectively. The effective thermal resistance Rth(min) ratios normalized by that of 80 mm FPHP were 2.4, 6.0, and 17.9 for lengths of 150 mm, 200 mm, and 300 mm, respectively. The maximum heat transport capability Qmax decreased greatly from 109.5 W to 49.6 W when length was increased from 80mm to 150 mm and then slowly decreased further to the minimum value of 35 W when the length was 300 mm. For the bending angle β from 0° to 90°, the maximum effective thermal conductivity Keff(max) increased from 1933W/mK to 6365W/mK, and the maximum heat transport capability Qmax increased from 45 W to 85 W. For the tilting angle θ from 0° to 90°, Keff(max) increased from 4561 W/mK to 5530 W/mK; whereas Rth(min) reduced from 0.22 W/K to 0.182 W/K. And the maximum heat transport capability Qmax increased from 39.7 W to 130 W. On the other hand, by tilting from 0° to -30°, the maximum heat transport capability Qmax reduced drastically to 3 W. That is, by the proper liquid filling ratio, length, bending angle and tilting angle, cooling enhancement of the FPHPs could be greatly achieved.

    Abstract I 摘要 II 誌謝 III Contents IV List of Tables VI List of Figures VII Nomenclature IX Chapter 1 Introduction 1 1-1 Motivation and background 1 1-2 Literature review 3 1-3 Review of CFD simulations 7 1-4 Research objectives 8 1-5 Organizations 9 Chapter 2 FPHP Theory Analysis 10 2-1 Principles of heat pipe operation 10 2-2 CFD Theory 15 2-3 Parameter Definition: Fr, Rth, Keff, ΔT, Qmax 17 2-4 Error Analysis and Sensitivity analysis 19 2-5 The equivalent Keff(max) and Qmax equation 20 Chapter 3 Experimental approach 22 3-1 Flate plate heat pipe fabrication process 22 3-2 Experimental FPHP sample fabrication 23 3-3 Experimental approach 27 Chapter 4 Experimental results and discussion 31 4-1 Cooling performance of flat plate heat pipes with different liquid filling ratios . 31 4-1-1 Effect of liquid filling ratio. 31 4-1-2 Thermal performance of the FPHP with liquid filling ratio of 25%. 36 4-1-3 Imperfection effect. 37 4-2 The length effect on the cooling performance of flat plate heat pipes 42 4-2-1 Optimum liquid filling ratio for different lengths 42 4-2-2 Thermal performance of FPHPs of different lengths. 44 4-3 The effects of bending angles on the cooling performance of flat plate heat pipes 48 4-3-1 Optimum liquid filling ratio for different bending angles. 48 4-3-2 Thermal performance of FPHPs of different bending angles. 49 4-4 Cooling enhancement of flat plate heat pipes by tilting 52 4-4-1 Optimum liquid filling ratio for different tilting angles. 54 4-4-2 Tilting effects on hot and cold temperature distributions. 54 4-4-3 Distributions of Rth, Keff, and Qmax 56 4-5 The equivalent Keff(max) and Qmax equation for prediction. 60 Chapter 5 Simulation results and discussion 61 5-1 FPHP simulation step 61 5-2 Model geometry and mesh 61 5-3 Material properties 62 5-4 Initial and boundary conditions 63 5-5 Solution techniques 63 5-6 Simulation results and discussion 64 Chapter 6. Conclusion and Suggestion 69 6-1 Conclusion. 69 6-2 Suggestion. 70 Reference 71 Appendix 1: Keff calculation program 78 Appendix 2: Qmax caculation program 82 Appendix 3: Acetone liquid-vapor two phase source term UDF code 86

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