## Chapter 5: Multiphase Flow Theory

This chapter discusses:

- Multiphase Notation
- The Homogeneous and Inhomogeneous Models
- Hydrodynamic Equations
- Multicomponent Multiphase Flow
- Interphase Momentum Transfer Models
- Solid Particle Collision Models
- Interphase Heat Transfer
- Multiple Size Group (MUSIG) Model
- The Algebraic Slip Model
- Turbulence Modeling in Multiphase Flow
- Additional Variables in Multiphase Flow
- Sources in Multiphase Flow
- Interphase Mass Transfer
- Free Surface Flow

Two distinct multiphase flow models are available in CFX, an Eulerian-Eulerian multiphase model and a Lagrangian Particle Tracking multiphase model. This section describes Eulerian-Eulerian multiphase flow theory. For information about modeling Eulerian-Eulerian multiphase flow in ANSYS CFX, see Multiphase Flow Modeling. Lagrangian Particle Tracking theory and modeling are described in Particle Transport Theory and Particle Transport Modeling, respectively.

You should be familiar with the mathematical implementation of single-phase flow before reading this section. For details, see Basic Solver Capability Theory.

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