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Anomalous drag-reducing phenomenon at a water/fish-mucus or polymer interface

Published online by Cambridge University Press:  29 March 2006

S. C. Ling  and
T. Y. J. Ling
S. C. Ling
Affiliation:
Department of Aerospace and Atmospheric Sciences, The Catholic University of America, Washington DC 20017
T. Y. J. Ling
Affiliation:
Department of Zoology, University of Maryland, College Park, Maryland 20742
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Abstract

The sublayer of a turbulent boundary-layer flow with and without polymer additives was measured by a simple optical technique having a high degree of spatial resolution. The reduction of skin friction with polymer additives was found to be due to a decrease in the effective viscosity of water at the interface between the mucus (glycoprotein) or polymer (polyethylene oxide) and the water and a thickening of the laminar sublayer. The rate at which mucus diffuses away from a medium-sized fish is almost constant for all swimming speeds.

Information

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 65 , Issue 3 , 16 September 1974 , pp. 499 - 512
Copyright
© 1974 Cambridge University Press

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