Experimental Study of Turbulent Fluctuations in Hydraulic Jumps
Publication: Journal of Hydraulic Engineering
Volume 141, Issue 7
Abstract
In an open channel, the transformation from a supercritical flow into a subcritical flow is a rapidly varied flow with large turbulent fluctuations, intense air entrainment, and substantial energy dissipation called a hydraulic jump. New experiments were conducted to quantify its fluctuating characteristics in terms of free-surface and two-phase flow properties for a wide range of Froude numbers () at relatively large Reynolds numbers (). The time-averaged free-surface profile presented a self-similar profile. The longitudinal movements of the jump were observed, showing both fast and very slow fluctuations for all Froude numbers. The air–water flow measurements quantified the intense aeration of the roller. Overall the present findings demonstrated the strong interactions between the jump roller turbulence and free-surface fluctuations.
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Acknowledgments
The authors acknowledge the generous advice of Dr. Frédéric Murzyn (ESTACA Laval, France). They thank the technical staff of the School of Civil Engineering at the University of Queensland for their assistance. The financial support of the Australian Research Council (Grant DP120100481) is acknowledged.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 141 • Issue 7 • July 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: May 14, 2014
Accepted: Jan 19, 2015
Published online: Mar 3, 2015
Published in print: Jul 1, 2015
Discussion open until: Aug 3, 2015
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