Number：

04100011

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Name：

曾憲中

Titles：

教授

Author：

Txer-Ming Jeng, Sheng-Chung Tzeng, Chi-Shan Hsiao, Yu-Chi We

Paper name：

LED之環狀金屬多孔性介質散熱座之自然對流熱傳分析

Name of activity：

2012 綠色科技工程與應用研討會(GTEA)暨綠色能源與冷凍空調學術研討會(GERA)

Keywords：heat transfer, rotating porous cylinder, impinging jet, confined/unconfined conditions, aluminum foams.

Abstract：This work experimentally investigated the heat transfer of a rotating porous cylinder under a circular impinging jet at the confined/unconfined conditions. The dimensions of the Al-foam cylinder were 40mm in diameter (D) and 20 mm height (H) excepting the 4mm-thickness spreader.Air was employed as the coolant . The diameter (d) of the circular nozzle was 20 mm. Relevant parameters included the rotational Reynolds number (Re=788~3163) the jet Reynolds number (Re=3325~16690) and the relative impinging height (C/d=0.05~9) The results indicated that for the pure roatiog condition the average Nusslt number (Nu) of the unconfined system was higher than that of the confined system at C/d=0.05 but there were few differences between these both systems at other at other values of C/d For the pure jet flow condition on the contrary the average Nusslt number (Nu)

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