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Viscous frictional torque in the flow between two concentric rotating rough cylinders

Published online by Cambridge University Press:  20 April 2006

Koichi Nakabayashi ,
Yutaka Yamada  and
Toshinori Kishimoto
Koichi Nakabayashi
Affiliation:
Department of Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Japan
Yutaka Yamada
Affiliation:
Department of Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Japan
Toshinori Kishimoto
Affiliation:
Shin Meiwa Industry Co., Ltd, Japan
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Abstract

This paper describes an experimental study of the effects of surface roughness on the flow between two concentric cylinders, one of which rotates. The surface roughness has some effects on the coefficient of viscous frictional torque CM in the transient and in the fully developed turbulent region. In the fully developed rough turbulent flow, the value of CM depends on both the Reynolds number Rω and the relative roughness rm/k in the case where the outer cylinder rotates, but CM depends only on rm/k in the case where the inner cylinder rotates. The effect of the surface roughness of the inner cylinder is greater than that of the outer one for both cases.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 119 , June 1982 , pp. 409 - 422
Copyright
© 1982 Cambridge University Press

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