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NUMERICAL STUDY FOR A SECONDARY CIRCULAR CLARIFIER WITH DENSITY EFFECT
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  • Journal title : Environmental Engineering Research
  • Volume 10, Issue 1,  2005, pp.15-21
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2005.10.1.015
 Title & Authors
NUMERICAL STUDY FOR A SECONDARY CIRCULAR CLARIFIER WITH DENSITY EFFECT
Kim, Hey-Suk; Shin, Mi-Soo; Jang, Dong-Soon; Lee, Sang-Ill; Park, Jong-Woon;
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 Abstract
A computer program is developed for the prediction of the flow pattern and the removal efficiency of suspended solid (SS) in a circular secondary clarifier. In this study the increased density effect by SS on hydrodynamics has been systematically investigated in terms of Froude Number (Fr), baffle existence, and a couple of important empirical models associated with the particle settling and Reynolds stresses. A control-volume based-finite difference method by Patankar is employed together with the SIMPLEC algorithm for the resolution of pressure-velocity coupling. The k-ε turbulence and its modified version are incorporated for the evaluation of Reynolds stresses. The calculation results predicts well the overall flow pattern such as the waterfall phenomenon at the front end of the clarifier and the bottom density current with the formation of strong recirculation especially for the case of decrease of Fr. Even if there are some noticeable differences in the prediction of two turbulence models, the calculated results of the radial velocity profiles are generally in good agreement against experimental data appeared in open literature. Parametric investigation has been systematically made with the Fr and baffle condition with detailed analysis.
 Keywords
 Language
English
 Cited by
1.
Sedimentation efficiency of two continuously operating circular settling tanks with different inlet- and outlet arrangements, Chemical Engineering Journal, 2011, 178, 217  crossref(new windwow)
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