可撓式熱管之材料與毛細性能分析

The Analysis of Material and Capillary Performance in Flexible Heat Pipe

蕭兆呈(Chao-Cheng Shiau)

指導教授 ： 陳希立

共同指導教授 ： 施文彬(Wen-Pin Shih)

國立臺灣大學/工學院/機械工程學研究所/碩士(2009年)

https://doi.org/10.6342/NTU.2009.00723

摘要

本論文為評估高分子（PDMS）可撓式熱管實作可行性之前期研究，研究重點著重於高分子溝槽板之毛細性能評估與高分子材料之熱傳性能改善，並據此設計對應之實驗。毛細性能實驗分析不同加熱功率、傾斜角度、工作流體與流道形狀對濕潤軸長造成的影響，並以G. P. Peterson所建立之理論模型代數解加以比較，討論其誤差的原因；改善材料熱傳性能實驗則分析不同導熱微粒種類與參雜濃度及材料配置下對混合材料熱傳導係數的影響。
毛細性能實驗結果顯示，濕潤軸長隨加熱功率與傾斜角度之增加而下降，工作流體使用甲醇與流道使用三角形流道時有較佳的毛細性能，且蒸發段濕潤軸長實驗值約為G. P. Peterson代數解之3倍。改善材料熱傳性能實驗結果顯示使用奈米碳管粉末與銅粉末分別可提升PDMS之熱傳導係數5.88倍與4.98倍，而骨架式的材料配置在使用銅質彈簧時可提升PDMS熱傳導係數達16.52倍。

關鍵字

PDMS ； 高分子溝槽板 ； 毛細性能 ； 濕潤軸長 ； 熱傳導係數

並列摘要

The present thesis is a former research to evaluate the feasibility of fabricating a polymer (PDMS) flexible heat pipe. Present research focuses on the capillary performance evaluation of the polymer grooved plate and the thermal performance improvement of polymer material, corresponding experiment thus established. The capillary performance experiment analyzes the varying of axial wetted length by adjusting input power, inclined angle, working fluid, and the shape of flow channel. Results are compared with the algebraic solution of the model developed by G. P. Peterson. The reason of deviation is discussed. The thermal performance experiment analyzes the varying thermal conductivity of the blend material by adjusting conductive filler type, concentration of conductive filler and the material arrangement.
The results of capillary performance experiment indicate that the axial wetted length decreases with the increase of input power and inclined angle. Choose methanol as working fluid and triangular shape as flow channel exhibit the better capillary performance. The algebraic solution developed by G. P. Peterson is one-third of the experiment result in value. The results of thermal performance experiment indicate that filler using CNT powder and copper powder can improve the thermal conductivity of PDMS 5.88 times and 4.98 times respectively. The idea of framework material arrangement improves the thermal conductivity of PDMS 16.52 times by using copper spring coil.

並列關鍵字

PDMS ； Polymer grooved plate ； Capillary performance ； Axial wetted length ； Thermal conductivity

參考文獻

[2] B. R. Babin, G. P. Peterson, and D. Wu, “Steady-state modeling and testing of a micro heat pipe,” Journal of Heat Transfer, vol. 112, no. 3, pp. 595-601, 1990.

[4] A. B. Duncan, and G. P. Peterson, “Charge optimization for a triangular-shaped etched micro heat pipe,” Journal of Thermophysics and Heat Transfer, vol. 9, no. 2, pp. 365-368, 1995.

[5] G. P. Peterson, and H. B. Ma, "Theoretical analysis of the maximum heat transport in triangular grooves: a study of idealized micro heat pipes," American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. pp. 185-192, 1995.

[7] X. Xu, and V. P. Carey, “Film evaporation from a micro-grooved surface - An approximate heat transfer model and its comparison with experimental data,” Journal of Thermophysics and Heat Transfer, vol. 4, pp. 512-520, 1990.

[9] J. M. Ha, and G. P. Peterson, "Analytical prediction of the axial dryout point for evaporating liquids in triangular microgrooves," American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. pp. 53-61, 1993.