Number：

01097009

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Name：

曾憲中(Sheng-Chung Tzeng)

Titles：

Professor

Author：

Sheng-Chung Tzeng,Tzer-Ming Jeng,Po Chou,Feng-Zhang Tang,Yi-Chen Chen

Paper name：

Study on Heat Transfer Characteristics of Porous Metallic Heat Sink with Conductive Pipe under Bypass Effect

Name of activity：

Heat Transfer-Asian Research

Keywords：heat sink,bypass effect,aluminum foam,conductive pipe

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 Rey number (Re), the relative top by-pass gap (C/H), and the relative side by-pass gap (S/L). The size of the heat sink was 60 mm (L) x 60 mm (W) x 24 mm (H). Two heat sinks 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 20 mm diameter copper cylinder. The copper cylinder was used as a conductive pipe of heat of heat sink. The average Nusselt number was examined under various forced convection conditions. Experimental results demonstrate that increasing by-pass space decreased the Nusselt number. Besides the average Nusselt number of mode B heat sink was higher than that of mode A heat sink by 30% for the case without by-pass flow. The heat transfer enhancement by the copper cylinder would decline as the by-pass space grew.

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