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TECHNICAL BRIEFS

On the Roughness Reynolds Number Transition Criterion

[+] Author and Article Information
J. A. Masad

High Technology Corp., 28 Research Drive, Hampton, VA 23666

J. Fluids Eng 117(4), 727-729 (Dec 01, 1995) (3 pages) doi:10.1115/1.2817329 History: Received June 01, 1994; Revised June 08, 1995; Online December 04, 2007

Abstract

The theoretically validated Fage’s transition criterion for predicting transition in flow over a single roughness element is used to show that in the widely used roughness Reynolds number (Rek ) transition criterion, the critical value of Rek depends strongly on the length of the roughness element. At roughness length where the criterion is valid, the variation of the roughness height with free-stream Reynolds number is quantified.

Copyright © 1995 by The American Society of Mechanical Engineers
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