105 Summary

State of the art CFD models can be used to make a priori predictions of flow in stirred reactors, at least for homogeneous systems. Quasi-steady approaches (MRF or computational snapshot approach) look promising, in view of their a priori nature and low computational requirements. They can predict the flow generated by impellers of arbitrary shape and can predict interaction between multiple impellers. They can be extended to simulate multiphase flows as well. In general, predicted results show good agreement with experimental data. Important characteristic flow features around impeller blades are captured adequately. Careful numerical experiments using these CFD models can be used to better understand the characteristics of existing reactor hardware and to enhance performance. Even in the case of multiphase flows, where accurate quantitative predictions are difficult, computational models will be for qualitative grading of different configurations, and can greatly assist engineering decision making process.

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