金屬網狀熱管之毛細力分析研究

近年來熱管廠商林立，各家熱管廠皆在熱管的熱傳輸效能與生產成本間尋求最佳的平衡點，以金屬網為毛細結構之熱管，生產成本遠低於燒結式熱管，其擁有較好的滲透率但其毛細壓力低於燒結式熱管，以致其熱傳輸效能略低於燒結式熱管，因而本論文之重點為設計一方法，在不增加熱管成本的前提下提昇金屬網結構之毛細壓力。　　本論文考慮金屬網之幾何結構、流體接觸角對其所產生之表面自由能及毛細壓力之影響，將金屬網分為漸擴區與漸縮區討論並推導出其方程式加以模擬。吾人並提出一方法，可透過設計金屬網格交角θ與液體接觸角β控制毛細壓力為助力或阻力。經模擬後，吾人所推導之公式成功地符合物理性質。歸納出在液膜形狀為凹　凹的情況下，金屬網格交角越小可得到越大的毛細壓力，擴大以金屬網為毛細結構之熱管在設計上之可變化性，並且通過軟體預先分析，可預測所設計之熱管毛細結構所產生的毛細力，免除製作許多不同規格熱管再測試所耗費之人員成本與時間。

關鍵字

熱管；毛細壓力；表面自由能；接觸角

並列摘要

Since there are more and more heat pipe manufacturers established in recent years. Every heat pipe manufacturers in Taiwan tries its best to find the best balance between the costs and performance of the heat pipe. The costs of mesh wick heat pipe are much lower than sintered heat pipe. However, the performance of the former is a little lower than the latter. Therefore, the aim of this thesis is to design a method that can enhance the performance of the mesh wick heat pipe without extra costs. In this thesis, I separated the mesh wick into expanding area and shrinking area, then, I derived the equation of them individually for simulation. There are two conclusions of this thesis. First, we can design the capillary force of the mesh wick to be aiding or retarding via analyzing the construction of mesh wick and fluid contact angle. Second, according to results of simulation, we found that if the degree of mesh wick is smaller, the capillary force of mesh wick will be large. After all, By the software pre-analysis, we can eliminate the costs and time of heat pipe manufacturers and enhance the performance of the heat pipe.

並列關鍵字

heat pipe ； capillary force ； surface energy ； contact angle

參考文獻

[24]趙淇，“含金屬網毛細結構之平板熱管蒸發熱阻之研究”，國立清華大學動力機械工程研究所，碩士論文，2007

[20]呂宗行、張珮郁，”微流元件內表面張力驅動之流體流動現象的實驗探討”，碩士論文，國立成功大學航太工程學系研究所，2003年

[16]趙健燁，”生物碟片之分離定量功能與精確閥門設計”，臺北科技大學機電整合研究所，碩士論文，2006年

[2] Grover, G. M., Cotter, T. P., and Erickson, G. F., ”Structure of Very High Thermal Conductance,” Journal of Applied PHYS., Vol. 35, 1964.

[7] Faghri, A., ”Heat Pipe Science and Technology”, Taylor and Francis, Washington, DC, 1995

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金屬網狀熱管之毛細力分析研究

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