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Testing an Integral Model for Simulation of Thermal Discharges

Author(s): A. Etemadshahidi; A. H. Azimi

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Keywords: Ocean outfalls dilution; Integral model; VISJET; Thermal discharge; Numerical simulation

Abstract: Mixing of heated water which is discharged from outfalls is an efficient and effective method of waste disposal in coastal areas. Discharging the heated water with large quantities of mass flux generally requires multi-port diffusers. In recent years using mixing zone models to predict the plume behavior has received attention from many researches, who are interested in design of outfalls. This study examines the performance of an integral-type model (VISJET) in two applications involving physical models of multi-port diffusers. It was found that the models outputs are in good agreement with experimental results. Comparison between results predicted by VISJET and physical model observations indicates a linear relationship between the ratio of H/Lb to initial dilution where H is the water depth and L b is the velocity upward or downward flotation distance beyond which a plume becomes strongly advected by cross flow. Furthermore, an equation is proposed as a first estimate for initial dilution before simulating the flow with models.


Year: 2003

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