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Modeling aspects of flow and solute transport simulations in water disinfection tanks

Kim, Dongjin, Stoesser, Thorsten and Kim, Jae-Hong 2013. Modeling aspects of flow and solute transport simulations in water disinfection tanks. Applied Mathematical Modelling 37 (16-17) , pp. 8039-8050. 10.1016/j.apm.2013.03.031

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Abstract

Water disinfection tanks such as chlorine and ozone contactors typically consist of multiple compartments featuring a serpentine flow pattern. Due to the complex hydrodynamics, the design and optimization of these tanks are often carried out by employing computational fluid dynamics (CFD) simulations. The present study demonstrates the influence of certain modeling aspects when the widely used Reynolds-Averaged Navier Stokes (RANS) based CFD approach to predict hydrodynamics and disinfection performance is employed. Three different contact tank geometries are examined numerically using RANS. The time-averaged velocity predictions are reasonably accurate when compared to validation data. However, in baffled contact tanks, the time-averaged flow differs quite significantly from the instantaneous flow, with the consequence that RANS-based models require careful calibration of the turbulent mixing parameter, i.e., the turbulent Schmidt number, when computing transport of solutes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: Baffled disinfection tank; RANS; Turbulent Schmidt number; RTD
Publisher: Elsevier
ISSN: 0307-904X
Last Modified: 08 May 2019 02:38
URI: http://orca.cf.ac.uk/id/eprint/58659

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