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Environmental Engineering Research 2005;10(1): 15-21. DOI: https://doi.org/10.4491/eer.2005.10.1.015
NUMERICAL STUDY FOR A SECONDARY CIRCULAR CLARIFIER WITH DENSITY EFFECT
Hey-Suk Kim1, Mi-Soo Shin1, Dong-soon Jang1, Sang-ill Lee2, and Jong-woon Park3
1Department of Environmental Engineering, Chungnam National University 220 Gungdong Yusunggu, Daejon, 305-764, S. Korea
2Department of Environmental Engineering, Chungbuk National University 48 Kaeshindong Cheongju, Chungbuk, 361-763, S. Korea
3Daeyang Bio Tech CO., LTD, HanYang B/D, #276-9, Gyomundong, Guri city, Gyeonggido, 471-802, S. Korea
Corresponding Author: Dong-soon Jang ,Tel: +82-42-821-7756, Fax: +82-42-823-8362, Email: P_dsjang@cnu.ac.kr
Received: September 8, 2004;  Accepted: February 6, 2005.
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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- £ 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: Suspended solid | Froude number | waterfall phenomenon | bottom density current
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