Contents Chapter 14: Multiphase Flows | 14.4. Mixture Model Theory | Print page 14.4.4. Momentum EquationThe momentum equation for the mixture can be obtained by summing the individual momentum equations for all phases. It can be expressed as(14–122)where is the number of phases, is a body force, and is the viscosity of the mixture:(14–123) is the drift velocity for secondary phase :(14–124) « 14.4.3. Continuity Equation 14.4.5. Energy Equation »