Number：

01100004

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Name：

曾憲中

Titles：

Professor

Author：

Tzer-Ming Jeng, Sheng-Chung Tzeng, Yi-Chen Chen, Jian-Hong Chang

Paper name：

Thermal Behavior in a 180-deg Turned Channel with the Perforation Divider under Rotational Condition

Name of activity：

International Communications in Heat and Mass Transfer

Keywords：Heat transfer, 180-deg turning channel, Perforation

Abstract：To avoid the damage of the high-rotational-speed shaft by the poor thermal dissipation, this study provides a new configuration of the 180-deg turning channel with perforation divider. The perforations cross the divider let the coolant at the first duct to bypass into the second duct early. Such design provides a uniform cooling, preventing from the local high temperature. Additionally, the perforation-induced disturbing flow should enhance the total heat transfer. This work experimentally investigates the heat transfer characteristics of such system under the rotational condition. The results indicated that the perforation would reduce the raise of the local heat transfer within the turned region. Besides, the rotation would obviously influence the local heat transfer at the leading and trailing surfaces. The perforation increased the change due to the rotation. Furthermore, the effect of rotation on the total heat transferwas insignificant. It might be due to that the present rotational velocity (600RPM) was not large enough. Finally, the perforation system with d/D_h =2/4 had the similar total heat transfer capacity with that without perforation; the total heat transfer capacity of the perforation system with d/D_h =1/4 was around 20% higher than the non-perforation one.

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