An Elementary Analysis for Predicting the Momentum- and Heat- Transfer Characteristics of a Hydraulically Rough Surface

[+] Author and Article Information
M. J. Lewis

Abteilung fur die Sicherhelt der Kernanlagen, Wurenlingen, Switzerland

J. Heat Transfer 97(2), 249-254 (May 01, 1975) (6 pages) doi:10.1115/1.3450349 History: Received May 29, 1974; Online August 11, 2010


A simple model is presented which approximates the turbulent shear flow over a well-defined rough surface as a series of attached and separated flow regions. An elementary analysis applied to the model provides values for the well-known momentum- and heat-transfer roughness functions R(h+ ) and g(h+ , Pr), respectively. In order to use the calculation method the exact shape and distribution of the roughness elements are required together with a form drag coefficient and a characteristic separation length. These may be found in the literature for many roughness shapes of interest.

Copyright © 1975 by ASME
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