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Velocity gradients at the wall for flow around a cylinder for Reynolds numbers between 60 and 360

Published online by Cambridge University Press:  28 March 2006

Harry G. Dimopoulos  and
Thomas J. Hanratty
Harry G. Dimopoulos
Affiliation:
Department of Chemistry and Chemical Engineering, University of Illinois, Urbana, Illinois Present address: Shell Pipeline Corporation, Houston, Texas.
Thomas J. Hanratty
Affiliation:
Department of Chemistry and Chemical Engineering, University of Illinois, Urbana, Illinois
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Abstract

This paper shows how electrochemical techniques can be used in studies of flow around solid objects to measure the velocity gradient at the solid boundary. The method holds the advantages that it is not necessary to calibrate and that the test element is easy to fabricate. A study of the distribution of the wall velocity gradient around a cylinder of 1 in. diameter indicates that boundary-layer theory correctly predicts the measurements between the front stagnation point and the separation for Reynolds number, R, greater than 150. The wall velocity gradients in the wake are much smaller than in the front part of the cylinder and they reveal a minimum which is quite close to the separation point.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 33 , Issue 2 , 12 August 1968 , pp. 303 - 319
Copyright
© 1968 Cambridge University Press

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