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HEAT TRANSFER FROM A TURBULENT, SWIRLING, IMPINGING JET

J. Ward
The Open University in Wales, Cardiff, U.K.

M. Mahmood
Cranfield Institute of Technology, Cranfield, Bedford, U.K.

Abstract

This paper presents mass and heat transfer rates associated with orthogonal impingement of single, swirling, air jets onto flat plates. Mass transfer data were determined using a thin-film naphthalene sublimation technique and the Chilton-Colburn analogy was employed to infer the corresponding heat transfer coefficients. The swirl number was varied from 0 to 0.48 and the nozzle-to-plate separations ranged from 2 to 12 jet diameters. Jet Reynolds numbers of 32,000 and 60,000 (based on the mean nozzle exit velocity in the non-swirling case) were also studied. The application of swirl was found to significantly reduce the heat transfer rates. The average Nusselt numbers, for particular impingement areas, were correlated by means of a simple power-law dependence on the swirl and Reynolds numbers and also on the nozzle-to-plate separation.

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