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RESEARCH PAPERS

Turbulent Air Flow Over Rough Surfaces: Mean Flow Parameters

[+] Author and Article Information
J. J. Stukel

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

P. K. Hopke

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

K. Nourmohammadi

Nuclear Engineering Program, University of Illinois at Urbana-Champaign, Urbana, Ill. 61801

J. Fluids Eng 106(4), 405-409 (Dec 01, 1984) (5 pages) doi:10.1115/1.3243138 History: Received November 08, 1982; Online October 26, 2009

Abstract

The objective of the study was to examine experimentally the turbulent flow structure near a repeated-rib geometry rough-walled surface as a function of the ratio of roughness height to pipe radius (K/R), the ratio of spacing between the elements to roughness height (P/K), and the axial position with the rib cycle. The centerline axial flow velocity was found to vary sinusoidally in the axial direction within a rib cycle for P/K>10 for K/R = 0.1437 and P/K>13 for K/R = 0.100. The roughness effect on the mean velocity profiles was characterized using a logarithmic equation which utilized an error in origin and a roughness function that was a function of the error in origin. The equation was found to be valid for P/K values of 7 or less for K/R = 0.1437 and 13 for K/R = 0.1 geometries.

Copyright © 1984 by ASME
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