Examining the effects of velocity ratio of the pressurized flow to the main inlet flow on coagulants dispersion in pump diffusion mixer |
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Authors: | No-Suk Park Seong-Su Kim Kwan-Yeop Kim Sangyoung Park |
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Affiliation: | (1) BIOSYST- MeBioS, Katholieke Universiteit Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium |
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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 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 dispersed evenly in overall cross section on the condition that the velocity ratio is at least
over 20. |
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