124 Summary

Regimes of gas-solid flows in fluidized bed reactors have been discussed briefly. Two types of computational flow models, (1) discrete particle models and (2) granular flow models, are then discussed. Application of these models to fast-fluidized bed reactors (riser reactors) and bubbling/turbulent bed reactors has been discussed in detail. Recent computational work in this area has been reviewed. The importance of numerical issues such as grid refinement and discretization schemes have been highlighted with the help of examples. Some applications of computational flow models for reactor engineering of fluidized bed reactors were then discussed. Judicious use of computational models, coupled with other reaction engineering tools, will be useful to qualitatively grade different configurations and can greatly assist engineering decision-making processes. These models can substantially reduce the burden on experimental studies by providing efficient interpolation and extrapolation tools. Further work on parallelizing multifluid CFD codes will be necessary to carry out next generation, three-dimensional simulations of industrial fluidized bed reactors.

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