Abstract
In this study, characterization of mixing by side-entering impellers in large circular and rectangular vessels was conducted using a computational fluid dynamics technique. The mathematical formulas that calculate the impeller rotation-axis origin and direction for pre-processing were presented, resulting in predictions of the power and flow numbers as part of the post-processing. The simulated power and flow numbers of a single impeller in a cylindrical tank were validated against the laboratory specifications. The results indicated that an increase in the horizontal angle of the impeller towards the tank wall could produce a strong swirling flow, and that inclining the angle of the impeller towards the tank bottom could help to prevent solid particles from settling. Sensitivity analysis of the mixing by multiple impellers in cylindrical tanks was carried out to study the effect of the spacing between two adjacent impellers and the inclined angle for each impeller on the mixing performance. Optimal installation parameters for side-entry mixing systems were proposed. Also, mixing by four impellers in a rectangular lagoon was analyzed to achieve the best locations and orientations for the impeller installations.
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