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Limiting maximum drag-reduction asymptote for the moment coefficient of a rotating disk in drag-reducing surfactant solution

Published online by Cambridge University Press:  09 April 2002

SATOSHI OGATA  and
KEIZO WATANABE
SATOSHI OGATA
Affiliation:
Department of Mechanical Engineering, Graduate School of Engineering, Tokyo Metropolitan University Minami Ohsawa, Hachiooji-shi, Tokyo, 192-0397, Japan; [email protected]
KEIZO WATANABE
Affiliation:
Department of Mechanical Engineering, Graduate School of Engineering, Tokyo Metropolitan University Minami Ohsawa, Hachiooji-shi, Tokyo, 192-0397, Japan; [email protected]
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Abstract

In this study, the limiting maximum drag-reduction asymptote for the moment coefficient of a rotating disk in a surfactant solution was obtained analytically. The analysis, which was based on the logarithmic velocity profile of turbulent pipe flow in the surfactant solution, was carried out using momentum integral equations of the boundary layer, and the moment coefficient results agreed with experimental results for maximum drag reduction in surfactant solution. Additionally, flow visualization was performed using the tracer and the tuft techniques, which revealed that the direction of flow of surfactant solution on the disk was turned towards the circumferential direction and the amplitude of the circular vortex on the rotating disk was reduced by addition of surfactant solution. The experimental results for flow angle on a rotating disk can be explained well with the analytical results.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 457 , 25 April 2002 , pp. 325 - 337
Copyright
© 2002 Cambridge University Press

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