科技论文写作作业xjtu.docx

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写作方法作业
课程班级号:2
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An Experimental study on Evaporation/Boiling Heat
Transfer in Sintered Porous Wick
SUN Zhen HONG Fang-Jun ZHENG Ping
(School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)
Abstract We has designed and established an experimental apparatus to study the evaporation/boiling heat transfer in particle sintered porous wick under the working condition of heat pipe. The effects of particle size as well as the thickness and volumetric porosity of porous wick on evaporation/boiling heat transfer were investigated by using distilled water as working fluid. It was found that for the fixed particle size and porosity, there exists an optimal wick thickness corresponding to the maximum heat transfer coefficient. For the fixed thickness of porous wick, there is an optimal porosity when the heat flux is relatively low, however, the smaller the porosity is, and the higher the heat transfer coefficient is when heat flux is relatively high. An evaporation/boiling heat transfer model was also summarized to give plausible explanations of experimental results.
Key words particle sintered; porous wick; evaporation/boiling; heat pipe
0 Introduction
The flat heat pipe is a high-performance thermal diffusion technology which connects the electronic chip (heat sauce) and the heat sink. It can