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Laminar Free Convection from a Vertical Plate With Uniform Surface Heat Flux

1956; ASM International; Volume: 78; Issue: 2 Linguagem: Inglês

10.1115/1.4013697

0097-6822

E. M. Sparrow, J. L. Gregg,

Heat Transfer Mechanisms

Abstract An exact solution of the laminar boundary-layer equations for free convection from a vertical plate having uniform surface heat flux has been obtained. Heat-transfer parameters have been calculated for Prandtl numbers in the range 0.1 to 100. The results have been extrapolated to a Prandtl number of 0.01. Experimental results are compared with the theory and the agreement is found to be good. Heat-transfer results obtained from the von Kárm n-Pohlhausen method also are shown to be in good agreement with those from the exact solution. It is demonstrated that when average Nusselt numbers are calculated for a plate with uniform surface heat flux using the temperature difference halfway along the height, the results are very close to those for a uniform temperature plate.