Number：

02097008

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Name：

曾憲中(Sheng-chung Tseng)

Titles：

Professor

Author：

W.P. Ma,J.M. Jeng,S. C. Tzeng,T. F. Mao,F. Z.Tang,D.Y. Yu

Paper name：

Effect of Bypass Flow and Conductive Pipe on Thermal Performance of The Porous Metallic Heat Sink

Name of activity：

The 7th International Symposium on Heat Transfer

Keywords：

Abstract：

The work investigated the forced convection heat transfer of the heat sink situated in a rectangular channel by considering the bypass effect. The fluid medium was air. The relevant parameters were the Reynolds number (Re), the rrelative top by-pass gap (C/H), and the relative side by-pass gap (S/L). The size of the heat sink was 60mm(L)×60mm(L)×24mm(H). Two heat sins were employed as test specimens: (A) the 0.9-porosity aluminum-foam heat sink and (B) the 0.9-porosity aluminum-foam heat sink with a 30mm-diameter copper cylinder. The copper cylinder, used as a conductive pipe, was expected to enhance the thermal performance of the heat sink by increasing the heating area Local and average Nusselt numbers were examined. Experimental results demonstrate that increasing by-pass space decreased the Nusseltnumber, especially at the low by-pass level. Besides, the average Nusselt number of mode B heat sink was higher than that of mode A heat sink by 15-28% for the case without by-pass flow. The heat transfer enhancement by the copper cylinder would decline as the by-pass space growing. The experimental results can be used as a reference for related cooling designs.

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