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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

MIXED CONVECTION ON A HORIZONTAL PLATE WITH UNIFORM SURFACE HEAT FLUX

Get access (open in a dialog) DOI: 10.1615/IHTC6.3100
pages 85-90

Résumé

The effects of buoyancy-induced streamwise pressure gradients on laminar forced convection over a horizontal flat plate with uniform surface heat flux are studied analytically by the local similarity and local nonsimilarity methods of solution. Numerical results for the local surface heat transfer, wall shear stress, and velocity and temperature distributions are presented for a Prandtl number of 0.7 and for aiding flow with buoyancy force parameter Grx*/Rex3 ranging from 0 to 1.0. It is found that both the local Nusselt number and the local friction factor increase with increasing buoyancy forces. In addition, the buoyancy-affected velocity profiles exhibit an overshoot beyond the free stream velocity. With regard to the heat transfer results, significant buoyancy force effects were encountered for Grx*/Rex3 > 0.025. A comparison between the present results with those for the case of uniform wall temperature shows that heating by uniform surface heat flux provides con-siderably higher surface heat transfer rates than heating by uniform wall temperature.