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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

SINGLE PHASE LIQUID JET IMPINGEMENT COOLING OF SMALL HEAT SOURCES

Get access (open in a dialog) DOI: 10.1615/IHTC9.1680
pages 149-154

Abstract

Average heat transfer coefficients were determined experimentally for single phase liquid jet impingement cooling of small heat sources. The studies encompassed single jets, with diameters ranging from 0.457 mm to 6.55 mm, impinging on a single (12.7 mm square) heat source in both submerged and free-surface configurations. The nozzle-to-heater spacing was varied from 0.25 to 20 nozzle diameters, and flowrates were varied from 0.06 1/min to 10 1/min, resulting in Reynolds numbers (ReD) ranging from 200 to 50,000. Experiments were conducted with both water (Pr ≈7) and FC-77 (Pr ≈ 24). Heat transfer coefficients were found to be strongly dependent on jet velocity. Nozzle-to-heater spacing had a limited effect on free-surface jet, but a pronounced effect on submerged jet, results. Single submerged jet heat transfer coefficients were equal to, or greater than, those obtained with single free-surface jets for ReD ≥ 4000.