期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 70, 期 -, 页码 856-863出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2013.11.062
关键词
Heat transfer; Jet impingement; Micro pin fins; Electronics
资金
- Office of Naval Research through a MURI Grant [N00014-07-1-0723]
- National Science Foundation [ECS-0335765]
- Department of Mechanical, Aerospace, and Nuclear Engineering at Rensselaer Polytechnic Institute
Experiments to investigate the effects of cross flow area and pin fin shapes on the single-phase impingement point heat transfer coefficients of jet impingement on micro pin fins have been performed. The micro pin fins were circular, hydrofoil, square, and elliptical pin fins with characteristic lengths ranging from 50 mu m to 125 mu m. jet parameters were fixed with an orifice diameter of 2.0 mm and a stand-off ratio of 0.865. Using R134a as the working fluid, Reynolds numbers based on jet diameter were varied from 8000 to 80,000. Cross flow effects were found to have little to no significance on the heat transfer coefficients while area enhancement played a major role on the overall heat transfer enhancement. When comparing the various micro pin fins, the circular pin fins along with the square pin fins displayed the highest heat transfer coefficients for a given jet velocity. (C) 2013 Elsevier Ltd. All rights reserved.
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