## 12.4. Setting up an Equilibrium Phase Change Simulation

The Equilibrium Phase Change model requires that consistent material properties be supplied for the two pure substance states involved in the phase change, as well as the saturation curve (vaporization curve for vapor-liquid phase change, fusion line for liquid-solid phase change or the sublimation line for solid-vapor phase change). Although general material properties can be used with this model, in general, it is best practice to use this model with a real gas equation of state for the liquid, vapor and saturation properties. Saturation properties are defined by using a Homogeneous Binary Mixture. A Homogeneous Binary Mixture is a mixture of two states (solid, liquid or vapor) of the same pure substance.

There are three methods available to set up saturation properties in CFX:

- Using a pre-calculated Real Gas Property .rgp file.

- Using the Real Gas equation of state library.

- Using a general set-up, by incorporating two consistent materials (representing the two thermodynamic states) into your own homogeneous binary mixture.

For details, see Saturation Properties Tab in the CFX-Pre User's Guide.

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