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RESEARCH PAPERS: Additional Technical Papers

Response of a Turbulent Pipe Flow to a Change in Roughness

[+] Author and Article Information
W. D. Siuru

USAF; U. S. Military Academy, West Point, N.Y.

E. Logan

Mechanical Engineering, Arizona State University, Tempe, Ariz.

J. Fluids Eng 99(3), 548-553 (Sep 01, 1977) (6 pages) doi:10.1115/1.3448842 History: Received March 23, 1977; Online October 12, 2010

Abstract

Measurements of mean longitudinal velocities, static pressure, turbulence quantities and Reynolds shear stress were made in the region between fully-developed smooth wall and rough wall flows in a circular tube. The rough tube was formed by placing rectangular cross-sectioned rings inside a smooth pipe. A phenomenological model was developed to describe the flow in the region of change. The longitudinal pressure gradient responds very rapidly (within a couple of diameters) to the new wall roughness. The effect on the mean and fluctuating velocity parameters was found to grow with the half-power of the longitudinal distance from the start of the roughened tube for the case when the initial roughness element is upstanding.

Copyright © 1977 by ASME
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