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SINGLE PHASE LIQUID JET IMPINGEMENT COOLING OF SMALL HEAT SOURCES

D.J. Womac
School of Mechanical Engineering Purdue University, West Lafayette, IN 47907, USA

G. Aharoni
School of Mechanical Engineering Purdue University, West Lafayette, IN 47907, USA

Satish Ramadhyani
School of Mechanical Engineering, Purdue University Maurice J. Zucrow Laboratories West Lafayette, IN 47907-1288, USA

Frank P. Incropera
School of Mechanical Engineering, Purdue University, Indiana, U.S.A.; University of Notre Dame

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.

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