Turbulent Air Flow Over Rough Surfaces: II. Turbulent Flow Parameters

[+] Author and Article Information
Khosrow Nourmohammadi

Nuclear Engineering Program, University of Illinois, Urbana, Ill. 61801

P. K. Hopke

Institute for Environmental Studies, Nuclear Engineering Program, and Department of Civil Engineering, University of Illinois, Urbana, Ill. 61801

J. J. Stukel

Department of Civil Engineering, and Department of Mechanical Engineering, University of Illinois, Urbana, Ill. 61801

J. Fluids Eng 107(1), 55-60 (Mar 01, 1985) (6 pages) doi:10.1115/1.3242440 History: Received November 08, 1982; Online October 26, 2009


The objective of the present study was to examine experimentally the turbulent flow structure in a repeated rib geometry rough wall surface as a function of the ratio of the roughness height to the pipe diameter (K/D), the ratio of the spacing between the elements to the roughness height (P/K), the axial position within a rib cycle, and the Reynolds number. For small P/K values, the turbulent intensities and Reynolds shear stress variations were similar to those found for smooth wall pipe flow. Unique relationships for the u′ and v′ were found that were valid in the outer layer of the flow for all axial positions and all values of P/K and K/D.

Copyright © 1985 by ASME
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