## 8.11. Multiphase Reactions and Combustion

Multiphase Reactions refer to reactions involving components in different phases, and is a combination of simultaneous phase change and conversion of some materials into others. The capability is available for particle tracking calculations, but not `Eulerian-Eulerian` multiphase flows for this release of ANSYS CFX. When setting up a multiphase reaction, the Combustion Model setting in the Reaction details view is not required because `Finite Rate Chemistry` is the only available option for multiphase reactions (although for gas phase reactions, other reaction/combustion models may be applied).

A general multiphase reaction generates three classes of fluxes:

- Component Mass Sources

- Interphase Mass Transfer

- Interphase Energy Transfer

Multiphase reactions are specified in the Reaction details view by setting the Option to `Multiphase` on the Basic Settings form. For details, see Multiphase: Basic Settings in the CFX-Pre User's Guide.

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