A New Probe for Measurement of Velocity and Wall Shear Stress in Unsteady, Reversing Flow

[+] Author and Article Information
R. V. Westphal, J. K. Eaton, J. P. Johnston

Stanford University, Stanford, Calif.

J. Fluids Eng 103(3), 478-482 (Sep 01, 1981) (5 pages) doi:10.1115/1.3240819 History: Received August 18, 1980; Online October 26, 2009


Separated turbulent flows exhibit instantaneous reversals of flow direction which make measurement of the velocity field extremely difficult. A three-wire heat-tracer technique has been employed to measure streamwise velocity of a low-speed air flow very near a smooth, solid wall; the wall shear stress is calculated using a similarity hypothesis. Initial results presented show the evolution of average wall shear stress and rms fluctuation intensity of wall shear stress in a reattaching 2-D flow downstream of a backward-facing step.

Copyright © 1981 by ASME
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