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Velocity distributions in plane turbulent channel flows

Published online by Cambridge University Press:  19 April 2006

M. M. M. El Telbany  and
A. J. Reynolds
M. M. M. El Telbany
Affiliation:
Department of Mechanical Engineering, Brunel University, Uxbridge, Middlesex, England Permanent address: Faculty of Engineering, Helwan University, Egypt.
A. J. Reynolds
Affiliation:
Department of Mechanical Engineering, Brunel University, Uxbridge, Middlesex, England
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Abstract

Measurements of time-mean velocity have been made in a flat channel (aspect ratio 12 to 28), one of whose walls consists of a belt which can be moved in the direction of air blown through the channel or in the opposite direction. The wall layers generated in twenty-six turbulent flows, including plane Poiseuille and plane Couette cases, are compared with analytical results obtained by Kader & Yaglom and by Townsend. Empirical descriptions are developed for the viscous, logarithmic and gradient portions of these wall layers. The core regions of both Couette-type and Poiseuille-type flows are also described empirically. Parallels are drawn with developing boundary layers, and phenomena are identified that relate to the relaminarization of boundary layers.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 100 , Issue 1 , 11 September 1980 , pp. 1 - 29
Copyright
© 1980 Cambridge University Press

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