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Heat and mass transfer between a rough wall and turbulent fluid flow at high Reynolds and Péclet numbers

Published online by Cambridge University Press:  29 March 2006

A. M. Yaglom  and
B. A. Kader
A. M. Yaglom
Affiliation:
Institute of Atmospheric Physics, Academy of Sciences of USSR, Moscow
B. A. Kader
Affiliation:
Moscow Institute of Mechanical Engineering for Chemical Industry
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Abstract

General dimensional and similarity arguments are applied to derive a heat and mass transfer law for fully turbulent flow along a rough wall. The derivation is quite analogous to Millikan's (1939) derivation of a skin-friction law for smooth-and rough-wall flows and to the derivation of the heat and mass transfer law for smooth-wall flows by Fortier (1968a, b) and Kader & Yaglom (1970, 1972).

The equations derived for the heat or mass transfer coefficient (Stanton number) Ch and Nusselt number Nu include the constant term β of the logarithmic equation for the mean temperature or concentration of a diffusing substance. This term is a function of the Prandtl number, the dimensionless height of wall protrusions and of the parameters describing the shapes and spatial distribution of the protrusions. The general form of the function β is roughly estimated by a simplified analysis of the eddy-diffusivity behaviour in the proximity of the wall (in the gaps between the wall protrusions). Approximate values of the numerical coefficients of the equation for β are found from measurements of the mean velocity and temperature (or concentration) above rough walls. The equation agrees satisfactorily with all the available experimental data. It is noted that the results obtained indicate that roughness affects heat and mass transfer in two ways: it produces the additional disturbances augmenting the heat and mass transfer and simultaneously retards the fluid flow in the proximity of the wall. This second effect leads in some cases to deterioration of heat and mass transfer from a rough wall as compared with the case of a smooth wall at the same values of the Reynolds and Prandtl numbers.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 62 , Issue 3 , 11 February 1974 , pp. 601 - 623
Copyright
© 1974 Cambridge University Press

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