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TECHNICAL BRIEFS

A Note on Irrotational Curvilinear Flow Past a Weir

[+] Author and Article Information
Amruthur S. Ramamurthy

Concordia University, 1455 de Maisonneuve West, Montreal, Quebec, Canada, H3G 1M8

Ngoc-Diep Vo

Concordia University, Montreal, Quebec, Canada H3G 1M8

R. Balachandar

Atomic Energy of Canada, Manitoba, Canada

J. Fluids Eng 116(2), 378-381 (Jun 01, 1994) (4 pages) doi:10.1115/1.2910286 History: Received September 15, 1992; Revised May 24, 1993; Online May 23, 2008

Abstract

Curvilinear flows are commonly encountered in hydraulic engineering practice. Detailed velocity surveys of the curvilinear flow field over a circular-crested two dimensional weir were obtained using laser doppler velocimetry (LDV). Using these test data, the basic assumptions related to the streamline geometry and irrotational of flow over weirs made in all existing theoretical weir models are verified. The test data yielded the pattern, slope and curvature of the streamlines. Water surface profiles were also obtained to determine the depth of flow over the crest and the radius of curvature of the surface streamline at the crest section. As part of the study, the velocity profile of the flow over the weir crest was integrated to obtain the weir discharge coefficient. The weir coefficient obtained on the basis of this empirical procedure is compared with the weir coefficient based on direct discharge measurement.

Copyright © 1994 by The American Society of Mechanical Engineers
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