Enter the Dispersed phase volume fraction (dimensionless) in the ϕd0 field.

If Solve for interfacial area is selected under the Physical Model section, the dispersed phase number density is also specified. The dispersed phase number density can be specified directly,

or, when Diameter of particles/droplets is selected, computed from the diameter of particles and droplets dd:

This is the default for the Outlet node. This boundary condition is appropriate for boundaries where the dispersed phase leaves the domain with the dispersed phase velocity ud. No condition is imposed on the volume fractions at the boundary.

A corresponding flux condition is also applied for the number density equation (when Solve for interfacial area is selected under the Physical Model section).

Enter the Dispersed phase flux (SI unit: m/s) in the field.

If Solve for interfacial area is selected under the Physical Model section, the number density flux through the boundary is also specified:

A corresponding flux condition is also applied for the number density equation (when Solve for interfacial area is selected under the Physical Model section).

In the case of moving Wall and Interior Wall, the dispersed flux through the boundary is:

This implies that the flux, relative to the boundary motion, is zero. A corresponding flux condition is also applied for the number density equation (when Solve for interfacial area is selected under the Physical Model section).