### 5.5.3. Interphase Drag for the Mixture Model

In the mixture model, a non-dimensional drag coefficient is defined as follows:

| (5–65)

where is the total drag exerted by phase on phase per unit volume.

The mixture density is given by:

| (5–66)

and the interfacial area per unit volume is given by:

| (5–67)

where is a user-specified mixture length scale.

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