ARTICLE:

• INFLUENCE OF IMPINGEMENT FLOW ON THE PERFORMANCE OF PLATE HEAT SINK  download article

K. S. Yang
Energy & Environment Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan 310

C. Y. Lin
Mechanical Engineering Department, National Yunlin University of Science and Technology, Yunlin, Taiwan 640

Ing Youn Chen
Mechanical Engineering Department, National Yunlin University of Science and Technology, Yunlin, Taiwan 640

K. H. Chien
Energy & Environment Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan 310

Chi-Chuan Wang
Energy and Resources Laboratories, Industrial Technology Research Institute, Taiwan, R.O.C.

ABSTRACT

The present study deals with experiments concerning the influence between the impingement air flow and cross flow arrangements on the performance of plate heat sink. A total of six heat sinks with different fin height and fin pitch are made and tested. For cross flow arrangement, the corresponding heat transfer coefficients and pressure drops both increase with the decrease of the fin spacing. However, the effect of fin pitch on the heat transfer coefficient for impingement flow arrangement is negligible due to appreciable change of flow field. For cross flow arrangement, the heat transfer coefficient decreases with the rise of fin height, but the pressure drop is independent of fin height. It is also found that considerable increase of the pressure drop for impingement flow is encountered if the fin height is reduced, implying the pressure drop for impingement flow depends on inlet and outlet conditions. At a fixed pumping power, the thermal resistance for cross flow arrangement is always higher than those of impingement flow regardless of fin spacing and fin height. For the same pumping power, a smaller fin pitch or a larger fin height results in a better thermal resistance.

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