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RESEARCH PAPERS

Calculation of Variable Property Turbulent Friction and Heat Transfer in Rough Pipes

[+] Author and Article Information
A. T. Wassel

Science Applications, Inc., El Segundo, CA

A. F. Mills

Department of Chemical, Nuclear and Thermal Engineering, University of California, Los Angeles, CA 90024

J. Heat Transfer 101(3), 469-474 (Aug 01, 1979) (6 pages) doi:10.1115/1.3451011 History: Received May 22, 1978; Online August 11, 2010

Abstract

A numerical calculation method for turbulent flow in rough pipes is developed. A mixing length model is used in the turbulent core while a roughness element drag coefficient and a sub-layer Stanton number are used to characterize transport to the wall. Sample wall relations are developed for sandgrain roughness and transverse repeated rib roughness, and it is shown that large roughness heights require accounting for terms of order of roughness height divided by pipe radius. For gas flows with cooling, the effects of variable properties are investigated for smooth walls and both roughness patterns. For smooth walls, comparison with experiment is satisfactory; for rough walls experimental data is not available. Simple power law formulae representing variable property effects for fully rough flows are presented.

Copyright © 1979 by ASME
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