Contents Chapter 14: Multiphase Flows | 14.4. Mixture Model Theory | Print page 14.4.7. Volume Fraction Equation for the Secondary PhasesFrom the continuity equation for secondary phase , the volume fraction equation for secondary phase can be obtained:(14–138) « 14.4.6. Relative (Slip) Velocity and the Drift Velocity 14.4.8. Granular Properties »