均熱板氣室高度對其性能及流體特性影響之研究

A study of The Impact to Vapor Chamber Performance by flow space

李國穎(Kuo-Ying Lee)

指導教授 ： 蘇程裕

國立臺北科技大學/機電學院/製造科技研究所/碩士(2007年)

摘要

本研究主要在探討Vapor Chamber(均熱板)內蒸氣流通空間對均熱板性能影響及相互關係。Vapor Chamber是被動式的二相熱傳元件，藉由密閉腔體內工作流體的蒸發、凝結循環而產生動力完成熱量的傳遞，蒸發凝結的程度取決於微結構的特性。Vapor Chamber應用與熱管相同的二相流理論，其組成有三大關鍵要素，即：密閉腔體、微結構與工作流體。然而均熱板為熱管概念的扁平化設計其造型不再侷限於管狀，其內部蒸氣流通截面為矩形而非圓形，必須有一方法來評估此蒸氣流通空間的設計。在熱管的發展過程中，於1963/12/02由美國原子能委員會(AEC)申請的專利『Evaporation Condensation Heat Transfer Device 』中,除了首次使用Heat Pipe的術語外，構造上也增大管內部蒸氣通路的斷面積，因而提高了熱管的使用性。由此可知蒸氣流通截面對均熱板的影響也同樣是一關鍵要素，本研究設計110x50mm均熱板，製作出5種不同高度的均熱板，藉由一系列的測試並經由水力直徑(Dh)，雷諾數(Re)，水頭損失飽和蒸汽沸騰曲線成核現象等分析，來評估氣室高度對流體特性與均熱板性能之影響和氣室高度與微結構厚度之關係，以求出最佳化的設計標準。

關鍵字

均熱板 ； 氣室高度

並列摘要

This article is to study the performance impact and relationship to Vapor Chamber by vapor flow space. Vapor Chamber is a passive phase change heat transfer device. The vaporization and condensation of fluid inside a sealed container create a recirculation power to complete heat transfer. The activities of vaporization and condensation are depends on wick characteristic. The theory of vapor chamber is same as heat pipe, two phase fluid theorem, and there are three key components to form a heat pipe, sealed container, wick structure, and working fluid. However, vapor chamber is like flat heat pipe, and it is no longer a pipe. The cross section for vapor flow inside chamber is rectangular instead of circle. There should be a design guide to evaluate the vapor cross section. In the development of heat pipe, a patent applied by AEC in 1963/12/02, 『Evaporation Condensation Heat Transfer Device 』 used the proper noun “heat pipe“ firstly, and increase the cross section of vapor flow, so that the application of heat pipe was being more popular. The impact of vapor flow space to vapor chamber is also the key issue in performance. The study designs a vapor camber 110x50mm, using pure water as working fluid, with various heights to research the relationship between vapor chamber performance and vapor flow space. Via a series of tests, and the analysis of hydraulic diameter, Renold number and head loss, and saturated vapor, boiling curve, and nucleate phenomenon, the study is to find out the relationship among performance, vapor flow space, and wick thickness and then to conclude a optimum design guide.

並列關鍵字

Vapor Chamber ； Vapor Space ； Mesh ； Wick

參考文獻

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