Preston Tube Calibrations and Direct Force Floating Element Measurements in a Two-Dimensional Turbulent Boundary Layer

[+] Author and Article Information
J. E. McAllister, M. H. Tennant

Savannah River Laboratory, E. I. du Pont de Nemours & Co., Aiken, S. C. 29801

F. J. Pierce

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

J. Fluids Eng 104(2), 156-160 (Jun 01, 1982) (5 pages) doi:10.1115/1.3241795 History: Received May 07, 1981; Online October 26, 2009


Preston tubes provide a convenient means of estimating local wall shear stress. Practical difficulties arise from a lack of calibration data obtained in turbulent boundary layer flows and from the wide choice of calibration equations available mainly from pipe flow calibrations. The results of an experimental study comparing a large number of direct force local wall shear stress measurements in a near-zero pressure gradient two-dimensional turbulent boundary layer flow are presented. The results indicate that there is consistent and excellent agreement between the Patel intermediate calibration formula and the direct force measurements. Typical differences among the direct force measurements and several other proposed calibration equations are also shown.

Copyright © 1982 by ASME
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