Pressure Loss and Heat Transfer in Channels Roughened on Two Opposed Walls

[+] Author and Article Information
R. E. Mayle

Department of Mechanical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590 and Pratt & Whitney East Hartford, CT

J. Turbomach 113(1), 60-66 (Jan 01, 1991) (7 pages) doi:10.1115/1.2927738 History: Received January 17, 1989; Online June 09, 2008


In order to increase cooling effectiveness selectively, coolant channels in gas turbine components are often only roughened on one or two walls of the channel. A model is presented for flow in rectangular channels having two opposed roughened walls and a theory is developed for both the pressure loss and heat transfer. The theory allows one to calculate the heat transfer coefficient on each wall separately in addition to the overall friction factor and heat transfer coefficient. Comparisons are made to data for similarly configured channels, tubes, and surfaces roughened by regularly spaced transverse ribs placed normal to the flow direction. Correlations for the displacement velocity in the logarithmic law and the roughness Stanton number in terms of the rib pitch-to-height ratio and roughness Reynolds number are also presented.

Copyright © 1991 by The American Society of Mechanical Engineers
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