Title

Experimental Optimization of Confined Air Jet Impingement on a Pin Fin Heat Sink

Abstract

A variety of nozzle configurations were tested to characterize and optimize the performance of confined impinging air jets used in conjunction with a pin-fin heat sink. Four single Mean jet velocity, m/s. nozzles of different diameters and two multiple-nozzle arrays were studied at a fixed nozzle-to-target spacing, for different turbulent Reynolds numbers (5000 < Re < 20 000). Variations in the output power level of the heat source and nozzle-to- target spacing were found to have only modest effects on heat transfer at a fixed Reynolds number. Enhancement factors were computed for the heat sink relative to a bare surface, and were in the range of 2.8–9.7, with the largest value being obtained for the largest single nozzle (12.7 mm diameter). Average heat transfer coefficients and thermal resistance values are reported for the heat sink as a function of Reynolds number, air flow rate, pumping power, and pressure drop, to aid in optimizing the jet impingement configuration for given design constraints.

Keywords

air jets, confined jets, electronics cooling, heat sinks, heat transfer, jet impingement, pin fins

Date of this Version

9-1-1999

Published in:

L. A. Brignoni and S. V. Garimella, “Experimental Optimization of Confined Air Jet Impingement on a Pin Fin Heat Sink,” IEEE Transactions on Components and Packaging Technologies, Vol. 22, No. 3, pp. 399-404, 1999.

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