7.3. Eulerian-Eulerian Multiphase Versus Particle Transport

A multiphase flow containing dispersed particles may be modeled using either the particle transport (Lagrangian Particle Tracking) model or the Eulerian-Eulerian multiphase model. Some advantages and disadvantages of the Eulerian-Eulerian multiphase model are given below to aid in the choice of model. The equivalent section for the particle transport model is available in Particle Transport Versus Eulerian-Eulerian Multiphase.

Table 7.1:  Eulerian-Eulerian Multiphase vs. Particle Transport

Advantages of Eulerian-Eulerian Multiphase

Disadvantages of Eulerian-Eulerian Multiphase

Complete global information for the particle phase is available

Expensive if many sets of equations are used; that is, if there are many particle sizes. However, the homogeneous MUSIG model is an Eulerian-Eulerian model that uses a single velocity field for multiple size groups.

Applicable for wide range of volume fractions

Knowledge of the diffusion coefficients is incomplete

Relatively cheap for one additional set of equations

Difficult to get accuracy over a range of particle sizes for combustive flows

Turbulence is included automatically

When there is phase change, the particle diameter must be user-specified rather than calculated automatically by the model. This can decrease accuracy. (The droplet condensation model is an exception.)

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