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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2016012144
pages 893-914

ANALYSIS OF THE HYDRAULIC AND THERMAL PERFORMANCES OF A MICROCHANNEL HEAT SINK WITH EXTENDED-NOZZLE IMPINGING JETS

Tingzhen Ming
University of North Texas School of Civil Engineering and Architecture, Wuhan University of Technology
J. L. Gui
School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
C. Peng
School of Architecture and Urban Planning, Huazhong University of Science and Technology, Wuhan, 430074, China
Y. Tao
College of Engineering and Computing, Nova Southeastern University, Davie 33314, FL U.S.A.

RÉSUMÉ

A strong transverse main stream from upstream impinging jets will cause the flow direction of the downstream impinging jets to deflect greatly, which will significantly deteriorate the thermal performance of the microchannel heat sink with impinging jets. An idea of extending the length of the nozzles for the impinging jets has been introduced to avoid this negative effect and ultimately to enhance the thermal performance of microchannel heat sink jets. Mathematical models describing the fluid flow and heat transfer characteristics of the microchannel heat sink with extended-nozzle impinging jets (MHSEIJ) have been presented, and the thermal and hydraulic performances of the MHSEIJ with the lengths of extended nozzles being 0, 0.5, and 1.0 mm have been numerically investigated. From the results we can fi nd that: (1) the introduction of extended nozzles for impinging jets can greatly avoid the negative effect of the transverse main stream from upstream impinging jets; (2) increasing the length of extended nozzles will achieve better thermal performance of the MHSEIJ , accompanied by a reasonable increase in flow resistance; and (3) when Re is 18,000, the values of Nu are 258.15163 and 302.07749 for the MHSEIJ, with Le being 0 mm and 1.0 mm, causing an increase of 17%.