An Omnidirectional Wall Shear Meter

[+] Author and Article Information
M. H. Tennant

Savannah River Laboratory, E. I. du Pont de Nemours & Co., Aiken, S.C.

F. J. Pierce, J. E. McAllister

Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Va. 24061

J. Fluids Eng 102(1), 21-25 (Mar 01, 1980) (5 pages) doi:10.1115/1.3240619 History: Received February 12, 1979; Online October 26, 2009


An omnidirectional wall shear meter has been developed which is capable of the direct measurement of both magnitude and direction of wall shear stress. Linearity, resolution, and accuracy have been demonstrated analytically and experimentally by static and dynamic calibration. The floating element device works on the cantilevered beam principle. Eddy current probes, set at right angles to the beam and to each other, sense the magnitude and direction of deflection which can be calibrated against known force loadings. The device is used to measure wall shear stress in three-dimensional flows, and was specifically developed as a means of validating proposed three-dimensional near-wall similarity laws.

Copyright © 1980 by ASME
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