### 7.2.5. Polydispersed Flow

The above dispersed flow examples assume a single mean particle diameter for the dispersed phases. Poly-dispersed flows involve dispersed phases of different mean diameters.

One way to model such flows is to define a different phase for each particle size, as the particle size has a strong influence on interphase transfer. For example, to model the flow of air bubbles in water of different diameters, you need to create three fluids, such as `Air1`, `Air2`, `Air3`, each with the same material properties as air. Then, set the number of fluids equal to four, and select `Water`, `Air1`, `Air2` and `Air3` as the four fluids. Next, under Fluid Models, designate `Water` as the continuous phase, and the other three fluids as dispersed phases of desired mean diameters.

Information on an alternative way to model polydispersed flows is provided by the MUSIG model. For details, see Polydispersed, Multiple Size Group (MUSIG) Model.

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