高分子毛細結構在迴路式熱管之應用研究

Investigation of the Polymer Wick Structure Applied to Loop Heat Pipe

劉秉翰(Bing-Han Liu)

指導教授 ： 陳瑤明

國立臺灣大學/工學院/機械工程學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.01884

摘要

高分子毛細結構具有高孔隙度、低熱導係數等優點，而目前將高分子毛細結構應用於迴路式熱管的相關研究並不多見，因此本文旨在建立可應用於迴路式熱管高分子毛細結構之設計、製造及測試能力。依照迴路式熱管在操作時的限制與特性，選擇聚甲基丙酸甲酯作為毛細結構的材料，以鹽溶濾法(salt leaching)來製作高分子毛細結構。製作過程中遭遇到加工等問題，在文中提供一個較佳的解決方式。在製作出高分子毛細結構後，我們建立了一套冷態測試系統，用來量測其各項參數包括有效孔徑與滲透度，以預測其熱傳性能。
本實驗經由實際量測以鹽溶濾法製作出來的聚甲基丙酸甲酯毛細結構，其機械強度與耐熱性皆優於聚苯乙烯，有效孔徑約在14 ，孔隙度可控制在50~82%，綜整不同孔隙度的高分子毛細結構其滲透度後，找出滲透度與孔隙度相關的經驗公式，Kw=2.0×10^-10×ε^15.64，有助迴路式熱管的熱傳性能預測。

關鍵字

鹽溶濾法 ； 高分子毛細結構 ； 迴路式熱管

並列摘要

Polymer wick structure has the advantages that include high porosity, low thermal conductivity coefficient and lower manufacturing cost etc. However the relative researches on applying the polymer wick structure to LHP is still not familiar to date. Hence, the present effort seeks to set up the design, fabrication and test capacity of the polymer wick which is applicable to LHP. Based on the operating limitation and characteristics of LHP, poly-metyl methacrylate is chosen as the material and the polymer wick structure is fabricated by salt leaching method. Besides, after the polymer wick structure is made, the wick parameters that include pore radius and permeability are measured. The wick test system was made by our self .its help the prediction of the heat transfer.

The testing results show that, the arithmetic average pore diameter is 14 , and the porosity can be controlled within the range of 50~82%. Summarizing the dependent permeability of the polymer wicks upon different porosities, an empirical equation between permeability and porosity expressed as Kw=2.0×10^-10×ε^15.64 is established. This equation would help the prediction of the heat transfer capacity of LHP.

並列關鍵字

salt leaching ； polymer wick ； loop heat pipe

參考文獻

王鵬凱　“應用於迴路式熱管高分子毛細結構之製造研究”，國立台灣大學碩士論文, 2003.

Chun-Jen Liao, Chin-Fu Chen, Jui-Hsiang Chen, Shu-Fung Chiang, Yu-Ju Lin, Ken-Yuan Chang, “Fabriction of Porous biodegradable Polymer Scaffolds Using a Solvent Merging/Particulate Leaching Method,” John Wiley ＆ Sons, Inc., pp.676-681, 2001.

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