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Received December 1, 2009
Accepted July 20, 2010
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Examining the effects of velocity ratio of the pressurized flow to the main inlet flow on coagulants dispersion in pump diffusion mixer
Water Research Center, K-water Institute, Korea Water Resources Corporation (K-water), 462-1, Jeonmin-dong, Yusung-gu, Daejeon 305-730, Korea
nspark@kwater.or.kr
Korean Journal of Chemical Engineering, February 2011, 28(2), 519-526(8), 10.1007/s11814-010-0384-3
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Abstract
This study was conducted to evaluate the ratio of the pressurized flow to the main inlet flow, which has been considered one of the most important parameters for operating the pump diffusion mixer (PDM). Computational fluid dynamics (CFD) simulation was employed to evaluate the conventional operation rule of PDM and to propose a supplementary operating parameter and criterion. Test simulation of CFD was carried out for the 21 cases of flow ratio in a full scale PDM. The values of local velocity gradient were calculated in each case to analyze the simulation_x000D_
results in more detail. A wet test was conducted to verify CFD simulation results, which measures the factual coagulant dispersion distribution at a distance of 5.4 m from deflector. From results of both CFD simulation and wet test, the flow ratio was adequate as an operating parameter or criterion; also, the velocity ratio (dimensionless) of the pressurized flow to the main inlet was useful in predicting the performance of PDM. In addition, the injected coagulant could be_x000D_
dispersed evenly in overall cross section on the condition that the velocity ratio is at least over 20.
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Clark MM, Srivastava RM, Lang RR, Trussell RR, McCollum LJ, Bailey D, Christie JD, Stolarik G, Selection and design of mixing processes for coagulation., AWWA Research Foundation, Denver, USA (1994)
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Versteeg HK, Malalasekera W, An introduction to computational fluid dynamics, Prentice-Hall, New Jersey (1995)
Park NS, Park H, Water Sci.Technol.: Water Supply., 2(5-6), 47 (2002)
