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
|
|
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.) |