Abstract
A simulation study reported on the velocity fields and the entropy generation of non-Newtonian fluids in a baffled stirred tank with Rushton turbine impeller. Two shear thinning fluids, carboxymethylcellulose (CMC) and xanthan gum (XG), with flow index (n) varying in the range from 0.64 to 0.85 are used as the working fluid. The steady state multiple reference frame and the realizable k–ε turbulence model is used for numerical simulation. The predicted velocities for a CMC solution with n = 0.85 compared with literature data, and overall good agreement observed. The effect of flow index on Reynolds number similarity, power number and flow number also studied. The present work also determines the entropy generation due to the fluid flow. The CFD simulation is applied to predict the effect of size of the impeller blade, impeller clearance, fluid flow behavior index and rotations of impeller on the spatial distribution of the total entropy generation.
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