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Three-dimensional laminar boundary layers in crosswise pressure gradients

Published online by Cambridge University Press:  29 March 2006

J. H. Horlock ,
A. K. Lewkowicz  and
J. Wordsworth
J. H. Horlock
Affiliation:
Engineering Department, University of Cambridge Present address: University of Salford, Salford M5 4WT, England.
A. K. Lewkowicz
Affiliation:
Department of Mechanical Engineering, University of Liverpool
J. Wordsworth
Affiliation:
INTERATOM, Bensberg, Cologne
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Abstract

Two attempts were made to develop a three-dimensional laminar boundary layer in the flow over a flat plate in a curved duct, establishing a negligible streamwise pressure gradient and, at the same time, an appreciable crosswise pressure gradient.

A first series of measurements was undertaken keeping the free-stream velocity at about 30 ft/s; the boundary layer was expected to be laminar, but appears to have been transitional. As was to be expected, the cross-flow in the boundary layer decreased gradually as the flow became progressively more turbulent.

In a second experiment, at a lower free-stream velocity of approximately 10 ft/s, the boundary layer was laminar. Its streamwise profile resembled closely the Blasius form, but the cross-flow near the edge of the boundary layer appears to have exceeded that predicted theoretically. However, there was a substantial experimental scatter in the measurements of the yaw angle, which in laminar boundary layers is difficult to obtain accurately.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 66 , Issue 4 , 11 December 1974 , pp. 641 - 655
Copyright
© 1974 Cambridge University Press

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