Bubble Entrainment and Distribution in a Model Spillway with Application to Total Dissolved Gas Minimization
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 6
Abstract
This paper focuses on an experimental study of the two-phase flow downstream of a laboratory model fish bypass. Experiments were performed on a 1:24 scale laboratory model of a fish bypass under consideration for construction at Wanapum Dam, on the Columbia River in Washington. The model was operated at the design condition of skimming flow regime and at the possible off-design plunging and surface jump regimes. Void fraction data were collected using an optical phase detection probe on a three-dimensional grid, and the phase indicator function was recorded at selected locations. It was found that in the laboratory model, the skimming flow regime effectively prevents bubbles from reaching deep into the tailrace, resulting in a considerably lower void fraction than plunging and surface jump regimes. For this geometry, the surface jump regime entrains air deeper than the plunging regime. To observe trends, the instantaneous source of total dissolved gas was estimated for the three regimes using the model data and several simplifying assumptions. Time distributions of the indicator function are also reported.
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Acknowledgments
The writers would like to acknowledge the Grant County Public Utility District No 2 of Grant County, Ephrata, Wash. for their partial support. Troy Lyons’ guidance on model operation issues is also deeply appreciated.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 6 • June 2008
Pages: 763 - 771
Copyright
© 2008 ASCE.
History
Received: Sep 20, 2005
Accepted: Oct 9, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
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