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Mixing Performance of Counter-Axial Flow Impeller using Computational Fluid Dynamics

Author : Ian Torotwa and Changying Ji

Pages : 283-289, DOI:
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In this study, turbulent flow fields in a baffled vessel stirred by counter-axial flow impeller have been investigated in comparison to the Rushton turbine. The resultant turbulence was numerically predicted using computational fluid dynamics (CFD). Turbulence models were developed in ANSYS Fluent 18.1 solver using the Navier-Stokes equation with the standard k-ε turbulence model. The Multiple Reference Frame (MRF) approach was used to simulate the impeller action in the vertical and horizontal planes of the stirred fluid volume. Velocity profiles generated from the simulations were used to predict and compare the performance of the two designs. To validate the CFD model, the simulation results were compared with experimental results from existing work and a satisfactory agreement was established. It was concluded that the counter-axial flow impeller could provide better turbulence characteristics that would improve the quality of mixing systems.

Keywords: Counter-axial flow impeller, Rushton turbine, Turbulent mixing, Computational Fluid Dynamics, Stirred vessel

Article published in International Journal of Current Engineering and Technology, Vol.8, No.2 (March/April 2018)

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