Research Article
Mar 1965
Study of Static Pressure Along a Rough Boundary
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VIEW THE REPLYAuthors: J. L. Chao, AM.ASCE, and Virgil A. SandbornAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 91, Issue 2
Abstract
An experimental study of the effect of roughness on the measurement of static pressure at a wall is reported. Uniform spheres were used to represent the roughness elements; they were packed in the maximum density pattern, one layer thick. Air in the form of a radial jet passed over the rough wall. Pressure measurements were made at the tops and bottoms as well as at several other points on the periphery of the spheres. The measurements showed that the pressure of a given sphere varied considerably depending on the location of the pressure tap. Readings from a series of top or bottom taps yielded pressure gradients of opposite sign and neither gradient agreed with that determined from the average vertical force on the sphere. The question of where to measure static pressure on a rough surface remains to be answered.
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Published In
Journal of the Hydraulics Division
Volume 91 • Issue 2 • March 1965
Pages: 193 - 204
Copyright
© 1965 American Society of Civil Engineers.
History
Published in print: Mar 1965
Published online: Feb 3, 2021
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Authors
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J. L. Chao, AM.ASCE
Assoc. Prof., Civ. Engrg. Dept., Oklahoma State Univ., Stillwater, Okla.
Virgil A. Sandborn
Assoc. Prof., Civ. Engrg. Dept., Colorado State Univ., Fort Collins, Colo.
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