## 5.8. Multiple Size Group (MUSIG) Model

The MUSIG (Multiple Size Group) model has been developed to handle polydispersed multiphase flows. By polydispersed, it means that the dispersed phase has a large variation in size. One of the attributes of polydispersed multiphase flow is that the different sizes of the dispersed phases interact with each other through the mechanisms of breakup and coalescence. Population balance is a well-established method for calculating the size distribution of a polydispersed phase, including breakup and coalescence effects. MUSIG provides a framework in which the population balance method can be incorporated into three-dimensional CFD calculations.

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