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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

BUOYANCY EFFECTS ON FORCED-CONVECTION HEAT TRANSFER IN HORIZONTAL BOUNDARY LAYERS

Get access (open in a dialog) DOI: 10.1615/IHTC6.3080
pages 73-78

Sinopsis

The effect of buoyancy forces on flows along horizontal walls at high Reynolds numbers is analysed. In Prandtl's classical boundary layer theory, which is usually applied for describing flows at high Reynolds numbers, all forces perpendicular to the main flow direction are neglected. Therefore, classical boundary layer theory neglects buoyancy forces in horizontal layers. This theory is extended to higher order theory to make the prediction of buoyancy effects on horizontal boundary layers possible.

In the higher order theory a pressure variation in the boundary layer occurs with lower pressure at the wall than at the edge. This produces acceleration of the flow and hence increases wall shear stress and heat transfer.