Measurement of Behavioral Properties of Entrained Ambient Water in a Stratified Bubble Plume
Publication: Journal of Hydraulic Engineering
Volume 135, Issue 11
Abstract
Flow properties of a bubble plume in density-stratified conditions are studied using planar laser-induced fluorescence (PLIF) flow visualization. Entrained ambient fluid is identified by applying an image intensity threshold to the PLIF images of passive dye tracer injected at the bubble diffuser. The density stratification gradually arrests the entrained ambient fluid, causing detrainment, or peeling, of the continuous phase fluid from the bubble plume core and intrusion of the detrained fluid at a level of neutral buoyancy; bubbles continue to rise above each detrainment zone. The peel and intrusion heights for the first detrainment event above the diffuser are measured from the thresholded PLIF images. The nondimensional frequency of fluctuations in the detrainment and intrusion heights is measured as 0.35 (where =frequency; =height above the diffuser; and =terminal rise velocity of the bubbles in a quiescent fluid), and this value compares well to the plume wandering frequency for similar experiments in unstratified reservoirs.
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Acknowledgments
This paper is based upon work supported by the National Science Foundation under Grant No. NSFCTS-0348572.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 135 • Issue 11 • November 2009
Pages: 983 - 988
Copyright
© 2009 ASCE.
History
Received: Jul 8, 2008
Accepted: Jun 1, 2009
Published online: Jun 2, 2009
Published in print: Nov 2009
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