Research Article
Mar 1963
Shear Measurement Technique for Rough Surfaces
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VIEW THE REPLYAuthors: Li-San Hwang and Emmett M. Laursen, M.ASCEAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 89, Issue 2
Abstract
Preston's technique of using a pitot tube that touches the boundary in order to measure the local shear has been extended to rough surfaces. An analysis, assuming the logarithmic velocity distribution, provides an estimate of the relationship between the dynamic-pressure reading and the intensity of shear. Experiments with sandpaper-roughened surfaces confirm the general nature of the analytical relationship and provide correction factors that could be used for surfaces of a similar texture. For other surface types, the relationships can be used for qualitative studies, but calibration would be necessary to obtain absolute values of shear.
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Published In
Journal of the Hydraulics Division
Volume 89 • Issue 2 • March 1963
Pages: 19 - 37
Copyright
© 1963 American Society of Civil Engineers.
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Published in print: Mar 1963
Published online: Feb 3, 2021
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Li-San Hwang
Research Asst., W. M. Keck Lab. of Hydraulics and Water Resources, California Inst. of Tech., Pasadena, Calif.
Emmett M. Laursen, M.ASCE
Prof. and Head, Dept. of Civ. Engrg., The Univ. of Arizona, Tucson, Ariz
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