Undular Hydraulic Jumps in Circular Conduits
Publication: Journal of Hydraulic Engineering
Volume 128, Issue 11
Abstract
Undular hydraulic jumps in circular conduits are considered with an experimental approach. Based on previous findings in rectangular channels, this research indicates differences in terms of shape effects. All present results depend on the filling ratio of the upstream conduit flow in addition to the upstream Froude number. The results include information on the wave crests and troughs, wave lengths, and generalized axial surface profiles. The wall surface profile is shown to be similar to the axial wave profile, but with smaller wave extrema and a wave shift. The design of conduits containing undular jumps should be avoided because of unstable flow. It is also demonstrated that conduits may choke in the presence of undular jumps, with a previously established choking number relating to a design limit. For flows with choking numbers in excess of 1, choking occurs associated with a transition from the free surface to the pressurized conduit flow.
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References
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 128 • Issue 11 • November 2002
Pages: 1008 - 1013
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Apr 19, 2001
Accepted: May 8, 2002
Published online: Oct 15, 2002
Published in print: Nov 2002
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