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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

MECHANISMS OF HEAT TRANSFER ENHANCEMENT AROUND THE STAGNATION POINT OF AN IMPINGING AIR JET LADEN WITH SOLID PARTICLES

Get access (open in a dialog) DOI: 10.1615/IHTC9.1370
pages 99-104

Sinopsis

This paper evaluates the heat transfer augmentation due to direct-contact heat exchange between particles and heat transfer surfaces. Regions near the stagnation point of an impinging air jet laden with solid particles are considered. Study of the relative contribution of direct-contact heat transfer necessitates experiments with different direct-contact heat exchange thermal conditions, where the contributions of other heat transfer mechanisms are held constant. Thus here primary attention was paid to conjugate heat transfer by both convection within the gas-solid suspension media and unsteady heat conduction within the solid heat transfer surface. The heat transfer augmentation from the suspension of solid in gases in an impinging jet was measured for three heat transfer surface materials, and compared with numerical results for direct-contact heat exchange between solid particles and solid surfaces. This comparison enables estimation of both the particle contacting period and the contribution of direct-contact heat exchange to the total heat transfer.