Numerical simulation of turbulent swirling gas-dispersed flow behind a sudden tube expansion

The mathematical model is developed and the swirling two-phase flow behind a sudden tube expansion is simulated numerically using the model of Reynolds stress transport. The gas phase is described by the threedimensional RANS-equations taking into account the back effect of particles on transport processes in gas. To calculate the dispersed phase dynamics in a swirling confined flow, the Euler approach are used. It is found that with an increase in size, the particle are not involved into the separated flow and keep a positive value of the averaged axial velocity along the computational domain. Due to inertia of particle, the zone of reverse flows for the dispersed phase is noticeably smaller than the recirculation zone of gas phase. Performance of the developed mathematical model for description of the swirling two-phase flows in the presence of detachment areas is shown.