de la thèse 142 CHAPTER 5. APPLICATION TO A POLYDISPERSE TWO-PHASE FLOW OF A CONFINED BLUFF BODY

5.5 Results for two-phase flow polydisperse case In this section, the downstream evolution of the air and particulate flow fields at a moderate mass loading (Mj = 22%) for a polydisperse test case is presented and discussed. Numerical results of the AVBP-EL and CDP solvers are compared to experiments. Axial and radial profiles of the gaseous and dispersed phases are presented in Subsections 5.5.1-5.5.3. Subsection 5.5.4 discusses the influence of the number of samples on the axial and radial velocity profiles. Particle-dispersion characteristics are analysed in Subsection 5.5.5, focusing on the dependence of particle trajectories and the slip velocities upon particle sizes. Figure 5.32 shows the initial particle number distribution used by both solvers at the corre-sponding injection plane. Levels are quite similar to the experimental ones (see Fig. 5.4 (b)) except for the two smallest classes (dp = 20 and 30 µm) but this is assumed to have minor effects in the simulation due to their negligible contribution to the overall mass distribution (see Fig. 5.4 (a)). Both solvers use the same particle injection parameters in order to make easier the comparison of particles profiles. Note however, that the injection planes are not the same (see Fig. 5.14). For the sake of clarity, only 4 classes are analysed in the following: dp = 20, 40, 60 and 80 µm