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RESEARCH PAPERS

Relaxation of the Turbulent Boundary Layer After an Abrupt Change From Rough to Smooth Wall (Data Bank Contribution)

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

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

M. H. Hosni

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

H. W. Coleman

Propulsion Research Center, Mechanical Engineering Department, University of Alabama in Huntsville, Huntsville, AL 35899

J. Fluids Eng 115(3), 379-382 (Sep 01, 1993) (4 pages) doi:10.1115/1.2910149 History: Received August 08, 1991; Revised October 27, 1992; Online May 23, 2008

Abstract

Measurements of velocity and turbulence intensity profiles and skin friction coefficient are presented for turbulent flat-plate boundary layer flow over a test surface with a rough-to-smooth step change in surface roughness. The first 0.9 m length of the test surface is roughened with 1.27 mm diameter hemispheres spaced 2 base diameters apart in a uniform staggered array, and the remaining 1.5 m length is smooth. The profiles are compared with previous data for all-rough cases under closely matched conditions in the same facility. The skin friction data are compared with previous data for both all-rough and all-smooth cases.

Copyright © 1993 by The American Society of Mechanical Engineers
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