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Início Arquivos Thermal Letter Representantes Futuras reuniões Assembléia das Conferências Internacionais de Transferência de Calor
International Heat Transfer Conference 4

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

MIXED FORCED AND FREE CONVECTION FROM A VERTICAL HEATED PLATE TO AIR

W. B. Hall
Nuclear Engineering Laboratories, University of Manchester, U.K.

P. H. Price
University of Manchester, England

DOI: 10.1615/IHTC4.3650
pages 1-10

Resumo

The effect of superimposing a forced upward flow on a turbulent free convection boundary layer has been measured.
It is found that as the forced flow velocity is increased, the heat transfer coefficient initially decreases and then increases; the minimum heat transfer coefficient is found to occur when the velocity of the forced flow coincides approximately with the peak velocity in the free convection layer. Turbulence measurements in the boundary layer confirm that under these conditions the level of turbulence is lower than with no forced flow. A tentative model is proposed for this rather unexpected behaviour.

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