Number：

04_06曾憲中

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Name：

Sheng-Chung Tzeng

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Experimental analysis of mixed convection heat transfer on heat sink of led lamp

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Keywords：pin-fin heat sink;LED;end-wall heat transfer;longitudinal spacing.

Abstract：The device made of fan and pin-fin heat sink should be a powerful heat sink for LED lamp.This study used transient liquid crystal experimentation to measure the end-wall heat transfer coefficient of linearly arrayed square pin array in the rectangular channel,and discussed the influence of longitudinal spacing on heat transfer.The relative transverse spacing(XT=ST/d)was set as 3,and the relative longitudinal spacing(XL=SL/d=1.88-5)and the Reynolds number(Re=11047-17937)were changed.Considering the end-wall area,the average Nusselt number with square pin was 1.46-2.58 times of that without square pin,and the square pin array of XL=3.75 had the maximum end-wall heat transfer gain.

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