| Abstract | ABSTRACT
A numerical study has been carried out to predict the
hydrodynamics of gas-solid two-phase flow through diffusers.
Eulerian-Lagrangian approach is used for the simulation of the
two phases. The continuous phase (gas) is simulated by solving
Reynolds-Averaged Navier-Stokes equations (RANS) with
different k-? two-equation turbulence models, while the
dispersed phase (solid) is simulated using particle tracking
method. Four-way coupling between the two phases has been
achieved by Appling turbulence modulation besides void
fraction and particle-source terms. Also the effects of interparticles
collisions, particle-wall collisions, and lift forces were
included. The model was validated with single and two-phase
flows. A comparison between three different k-? models namely
standard k-?, standard Chen-Kim model, and modified Chen-
Kim model was carried out. The results showed that the
modified Chen-Kim model gives better predictions than that of
the other two models. Acceptable agreement between current
numerical results and previous published experimental data was
achieved. |