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research-article

Effect of jet position on cooling an array of heated obstacles

[+] Author and Article Information
Hussein M. Maghrabie

Department of Mechanical Engineering, Faculty of Engineering, South Valley University Cairo, Select State/Province 33871 Egypt
Hussein_mag@eng.svu.edu.eg

M. Attalla

Department of Mechanical Engineering, Faculty of Engineering, South Valley University, Al Shoban Al Moslemin St., 83521 Qena, Egypt
moha_attalla@yahoo.com

Hany Fawaz

Department of Mechanical Engineering, National Research Centre, 33 El Buhouth St, Dokki, 12311 Cairo, Egypt
ehf20012001@hotmail.com

Mohamed Khalil

Department of Mechanical Engineering, Faculty of Engineering, Sohag University, Shark District, Sohag, Egypt
mohamed_ramadan@eng.sohag.edu.eg

1Corresponding author.

ASME doi:10.1115/1.4036788 History: Received September 15, 2016; Revised January 12, 2017

Abstract

Numerical study of the effect of jet position on cooling process of an array of heated obstacles simulating electronic components has been investigated based on Realizable k-e model. Jet positions have been changed to impinge each row of obstacles consecutively. The experiments have been achieved at three different values of jet-to-channel Reynolds number ratios, Rej/Rec=1, 2, and 4. In the present study, a comparison between two different cooling processes; cross flow only (CF) and jet impingement with cross flow (JICF) has been achieved. The flow structure, heat transfer characteristics over all array obstacles, and the pumping power have been investigated for different jet positions. The results show that the jet position affects significantly the flow structure, as well as the heat transfer characteristics. Ac-cording to the results of average heat transfer coefficient and the pumping power, the more effective jet position for all values of jet-to-channel Reynolds number ratios (1, 2, and 4) is achieved when the jets impinge the third row of obstacles (JP3).

Copyright (c) 2017 by ASME
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