Thiyam T. Devi and Bimlesh Kumar
Fluid flow, mixing tank, Rushton impeller, CFD
The hydrodynamics of fluid flow inside the stirred tanks are characterized by the flow patterns, which differ with the types of impeller (Rushton, CD-6), number of impellers (more than one) and their clear off distances (S1, S2, S3). Due to the wide application of stirred tanks in process industries, it is required to understand the hydrodynamics of fluid flow for its optimum design. Literature suggests that there exist three most significant flow patterns as parallel, merging and diverging flow in dual impeller–stirred tank at specific impeller clear off distances. In this study, these types of flow patterns have been analysed using computational fluid dynamics (CFD) techniques with multiple reference frame (MRF) impeller model in dual impeller (same diameter) of Rushton and CD-6 impeller since these two impellers act differently in the performance of stirred tanks. From the comparison of Rushton and CD-6 impeller in terms of mean flow and turbulent kinetic energy, it has been observed that there is no distinct difference in the formation of flow patterns, but apparently witnessed strong magnitude in the case of CD-6 impeller.
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