Faculty Publications
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Item Computational modeling of hydrodynamics and mixing in a batch stirred vessel(Taylor and Francis Ltd., 2021) Falleiro, L.H.; Ali, A.A.In this work, the hydrodynamics, mixing and sedimentation is numerically investigated in the batch stirred vessel through CFD. The flow field obtained by performing transient CFD simulations using multiple reference frame (MRF) and sliding mesh approach along with standard k-? turbulence model. The velocity field is investigated spatially and temporally and liquid circulation is quantified at various impeller speeds to find an optimum impeller speed. The importance of geometry of the draft tube baffles is investigated by quantifying the vorticity, mixing time, power requirement and quality of suspension in the batch stirred vessel. It is found that suspension quantity in a batch stirred vessel is strongly dependent on the hydrodynamics. The role of the draft tube and the inner baffles is further analyzed and found that proper positioning and length of the baffles is necessary to improve the turbulence characteristics and the quality of the suspension. © 2019 Taylor & Francis Group, LLC.Item Effect of baffle configuration on performance of batch stirred vessel(Springer, 2022) Ali, B.A.; Falleiro, L.H.Crystallization is often carried out in batch stirred vessels. However, it is difficult to obtain uniform crystal size distribution (CSD), as it strongly depends on prevailing flow field operating conditions. This is adversely affected by the geometry of stirred vessels. Hence in this work, CFD simulations were performed to investigate flow field, mixing and crystallization phenomena in a stirred vessel. The performance of the stirred vessel was compared with draft tube baffled stirred vessel. The flow field was quantified through liquid circulation and vorticity. The mixing was analyzed through macromixing time in the stirred vessel. The solubility data, nucleation, and growth kinetics were integrated with CFD through a user-defined function (UDF) to predict crystallization phenomena. The predicted results were validated with experimental data available in the literature. The effects of seed mass, size and temperature on CSD were investigated and optimum conditions [750 gm (seed mass); 500 µm (seed size); 308 K (temperature)] for favourable crystal growth were identified. The performance of the proposed baffled stirred vessel was found to be significant, and it supports enhancing flow field, mixing and crystallization process. © 2022, The Korean Institute of Chemical Engineers.