Number：

04098024

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Name：

曾憲中(S.C.Tseng)

Titles：

Professor

Author：

Tzer-Ming Jeng and Sheng-Chung Tzeng

Paper name：

Heat transfer of the metallic porous heat sink in a rectangular channel with top-bypass clearance

Name of activity：

中國機械工程學會第二十六屆全國學術研討會論文集(The 26th National Conference on Mechanical Engineering)

Keywords： Top-bypass effect, metallic porous heat sink heat transfer, experiment.

Abstract：

This work experimentally investigated the top-bypass effect on heat transfer of metallic porous heat sinks in a rectanglar channel.Four heat sinks of various porous-fin structures(5*5 Pin-fin，9*9pin-fin，10PPI al-foam and 40PPI al-foam) were used.The coolant was air this study.The varied parameters were Reynolds number (491≦Re≦3893)and relative top-bypass clearance (0≦C/Hf≦1.28).The results indicates that the 9*9 pin-fin heat sink had the highest average Nusselt number(Nu)，the 5*5pin-fin heat sink had the lowest Nu，and the Nu of al-foam heat sinks were medium.Besidum，the empirical formula of Nu in terms of Re and C/Hf were obtained by the pressure-drop balance principle and all the experimental data Finally，using the empirical of Nu，we found that Nu decreased 0.5-0.6 times of Nuo when C/Hf increased from 0 to 0.6，but Nu only decreased0.11-0.13 times of Nuo when C/Hfincreased from 0.6 to 1.2，wherein Nuo displays the average number without bypass effect.

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