Numerical Simulation of Turbulent Flow and Mixing in Gas–Liquid–Liquid Stirred Tanks (original) (raw)
2017, Industrial & Engineering Chemistry Research
The turbulent flows and macro-mixing processes in gas-liquidliquid flat-bottomed cylindrical stirred vessels agitated by a Rushton turbine have been numerically simulated based on the Eulerian multi-fluid approach using the RANS technique. Both the isotropic k-ε model and anisotropic Reynolds stress model are used. The numerical models are validated by means of comparing simulated flow field of agitated immiscible liquid-liquid dispersions to the corresponding experimental data from literature. The predicted time traces of normalized concentration and values of mixing time in gas-liquid-liquid stirred tanks are compared to the experimentally measured ones as well. Both the k-ε model and the Reynolds stress model correspond reasonably well to the experimental data in both turbulent liquid-liquid and gas-liquid-liquid stirred tanks, and the anisotropic Reynolds stress model produces better results in terms of flow field, homogenization curve and mixing time than the k-ε model. While the better accuracy of the Reynolds stress model comes at the cost of more computational time.
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