### 27.1.6. Material Details View: Homogeneous Binary Mixture

Homogeneous binary mixtures are used to define the phase boundary between two chemically equivalent materials in different thermodynamic states. For example, you could define the vapor pressure curve between water and steam. The vapor pressure curve is used by the flow solver to determine the saturation properties of the two materials. A homogeneous binary mixture is required for running the Equilibrium phase change model. Additionally, it can be used with the Eulerian multiphase thermal phase change model or the Lagrangian particle tracking evaporation model.

The Basic Settings tab is used to specify the two materials that form the mixture. On the Saturation Properties tab, the saturation properties can be specified.

#### 27.1.6.1. Basic Settings Tab

1. Select the Material Group(s).

2. Select the two constituent materials for the binary mixture.

3. The Material Description field is optional.

   For details, see Material Description.

#### 27.1.6.2. Saturation Properties Tab

##### 27.1.6.2.1. General

The `General` option can be used to specify the saturation temperature or Antoine coefficients for materials that do not use a table or Redlich Kwong equation of state. If you set Pressure > Option to `Antoine Equation` option, then the flow solver automatically calculates saturation temperature. For details, see Antoine Equation in the CFX-Solver Modeling Guide. If you set Pressure > Option to `Value`, you must specify the saturation pressure and the corresponding saturation temperature. For details, see Using a General Set-up in the CFX-Solver Modeling Guide.

##### 27.1.6.2.2. Table

Files of type (`*.rgp`) are filtered from the list of files in the current directory.

##### 27.1.6.2.3. Real Gas

When `Real Gas` is chosen, the saturation properties are calculated using the material properties specified for the constituent components, and there is no need to set any values. As a consequence, the material properties for components in the mixture must all use the same Real Gas equation of state. For details, see Using a Real Gas Equation of State in the CFX-Solver Modeling Guide.

##### 27.1.6.2.4. Table Generation

For details, see Table Generation.

Release 18.2 - © ANSYS, Inc. All rights reserved.