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RESEARCH PAPERS: Electronic Cooling

Fluid Flow and Thermal Characteristics of a Microchannel Heat Sink Subject to an Impinging Air Jet

[+] Author and Article Information
Seok Pil Jang

School of Aerospace and Mechanical Engineering Hankuk Aviation University Goyang, Gyeonggi-do, 412-791 Korea

Sung Jin Kim1

Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Daejeon, 305-701 Koreasungjinkim@kaist.ac.kr

1

Author for correspondence.

J. Heat Transfer 127(7), 770-779 (Dec 26, 2004) (10 pages) doi:10.1115/1.1924628 History: Received April 07, 2004; Revised December 26, 2004

In the present study, fluid-flow and heat-transfer characteristics of a microchannel heat sink subject to an impinging jet are experimentally investigated. In order to evaluate the cooling performance of a microchannel heat sink subject to an impinging jet under the condition of fixed pumping power, the pressure drop across the heat sink and temperature distributions at its base are measured. Specifically, a microthermal sensor array is fabricated and used to accurately measure temperature distributions at the base of the heat sink. Based on these experimental results, a correlation for the pressure drop across a microchannel heat sink subject to an impinging jet and a correlation for its thermal resistance are suggested. In addition, it is shown that the cooling performance of an optimized microchannel heat sink subject to an impinging jet is enhanced by about 21% compared to that of the optimized microchannel heat sink with a parallel flow under the fixed-pumping-power condition.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cooling technology for electronic equipment: (a) manifold microchannel heat sink (4); (b) microchannel heat sink

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Figure 2

Experimental apparatus

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Figure 3

Microthermal sensor array: (a) microfabricated microthermal sensor array; (b) junctions of a microthermal sensor array

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Figure 4

Porous medium approach: (a) microchannel heat sink subject to an impinging jet; (b) equivalent porous medium

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Figure 6

Temperature distribution measured experimentally on the base of the microchannel heat sink subject to an impinging jet

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