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

• Main Authors: Kuo-Ying Lee, 李國穎
• Other Authors: Cherng-Yuh Su
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/6uj95x

碩士 === 國立臺北科技大學 === 製造科技研究所 === 95 === 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.