Rosette Diffusers for Dense Effluents in Flowing Currents
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VIEW THE REPLYPublication: Journal of Hydraulic Engineering
Volume 144, Issue 1
Abstract
Laboratory experiments on rosette diffusers for dense concentrate disposal from seawater desalination plants into flowing currents are reported. The dimensionless parameters for riser spacing and current speed were typical of operating diffusers. Three-dimensional laser-induced fluorescence (3DLIF) was used to map tracer concentration fields from which the main geometrical and dilution parameters were obtained. As the current speed increases, dilution and impact distance increase and rise height decreases. The results were insensitive to planform orientation of the risers. The rise heights of the rosette jets were always less than that of a corresponding isolated jet in a stationary environment. Semiempirical equations were presented to predict dilution, rise height, and impact distance, and confidence levels for the predictions were estimated. The results did not become independent of riser spacing in the range tested, in contrast to studies in stationary water where the flow properties became dependent on riser spacing for . For narrow riser spacings and relatively slow current speeds, rosette diffusers have higher dilutions than equivalent conventional multiport diffusers, i.e., diffusers with the same length and number of ports, but for higher current speeds the rosette dilutions are significantly less than for the equivalent multiport diffuser.
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Acknowledgments
The authors are indebted to the U.S. Bureau of Reclamation for their financial support. We are also very grateful for numerous illuminating conversations on the topic of brine diffusers with Brett Miller of the University of New South Wales Water Research Laboratory.
References
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©2017 American Society of Civil Engineers.
History
Received: Sep 26, 2016
Accepted: Jul 14, 2017
Published online: Nov 15, 2017
Published in print: Jan 1, 2018
Discussion open until: Apr 15, 2018
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