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The entrainment function in turbulent boundary-layer and wall-jet calculations

Published online by Cambridge University Press:  28 March 2006

M. P. Escudier  and
W. B. Nicoll
M. P. Escudier
Affiliation:
Imperial College of Science and Technology, Department of Mechanical Engineering, Exhibition Road, London, S.W. 7
W. B. Nicoll
Affiliation:
Imperial College of Science and Technology, Department of Mechanical Engineering, Exhibition Road, London, S.W. 7
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Abstract

Some of the proposals made by Spalding (1964a) in his ‘Unified theory of friction, heat transfer, and mass transfer’ are examined. The two-component velocity-profile family proposed by Spalding is compared with measured boundary-layer and wall-jet velocity profiles and is shown to be adequate for flows with moderate wake components. The drag law implicit in the velocity-profile family is shown to be in good agreement with experimental data.

Recommendations are provided for entrainment functions for both boundary layers and wall jets.

Predictions of boundary-layer and wall-jet development, based on the recommended entrainment functions, are presented and compared with experiment. The predictions are in good agreement with experiment except in the vicinity of separation.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 25 , Issue 2 , June 1966 , pp. 337 - 366
Copyright
© 1966 Cambridge University Press

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