Abstract
Plunging water jets are used for oxygenation purposes due to their inherent advantages such as simplicity, energy efficiency, and low operational cost. Specifically, these provide an efficient gas-liquid interfacial area for dissolving oxygen in water. Oxygen transfer by plunging jets into stagnant water has received considerable attention; however, the oxygenation capacity of plunging water jets discharging into turbulent cross-flow has received limited attention. The flow characteristics such as volumetric oxygen transfer coefficient and standard oxygen transfer efficiency are evaluated considering water jet to cross-flow velocity ratio, jet fall height, cross-flow depth, and jet impact angle. Two equations are proposed for estimating the oxygen transfer rate for a single plunging jet in a turbulent cross-flow. Moreover, the dynamic behavior of the resulting two-phase air-water flow is investigated with the aid of flow visualization.
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Acknowledgments
The authors would like to acknowledge assistance provided by Ms. Shadi Aria and Kudzai Chipongo, and technical staff at the School of Engineering at Edith Cowan University.
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Published In
Journal of Environmental Engineering
Volume 143 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Apr 1, 2016
Accepted: Oct 18, 2016
Published ahead of print: Feb 10, 2017
Published online: Feb 11, 2017
Published in print: Jun 1, 2017
Discussion open until: Jul 11, 2017
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