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RESEARCH PAPERS

Heat Transfer in the Turbulent Boundary Layer With a Step Change in Surface Roughness

[+] Author and Article Information
R. P. Taylor, J. K. Taylor

Thermal & Fluid Dynamics Laboratory, Mechanical and Nuclear Engineering, Mississippi State University, Mississippi State, MS 39762

H. H. Hosni

Department of Mechanical Engineering, Kansas State University, Manhattan, KS 66506-5106

H. W. Coleman

Thermal and Fluid Dynamics Laboratory, Mechanical and Nuclear Engineering, Mississippi State University, Mississippi State, MS 39762

J. Turbomach 114(4), 788-794 (Oct 01, 1992) (7 pages) doi:10.1115/1.2928032 History: Received March 04, 1991; Online June 09, 2008

Abstract

Measurements of Stanton numbers, velocity profiles, temperature profiles, and turbulence intensity profiles are reported for turbulent flat plate boundary layer flows with a step change in surface roughness. The first 0.9 m length of the test surface is roughened with 1.27-mm-dia hemispheres spaced 2 base diameters apart in a staggered array. The remaining 1.5 m length is smooth. The experiments show that the step change from a rough to a smooth surface has a dramatic effect on the convective heat transfer. In many cases, the Stanton number drops below the smooth-wall correlation immediately downstream of the change in roughness. The Stanton number measurements are compared with predictions using the discrete element method with excellent results.

Copyright © 1992 by The American Society of Mechanical Engineers
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