Modelling and Numerical Calculation of Turbulent Gas-Solids Flows with the Euler/Lagrange Approach

Abstract

The paper summarises recent developments of the Euler/Lagrange approach for the prediction of particulate two-phase flows. Based on detailed experiments, the modelling of particle-wall collisions, including the effect of wall roughness, could be considerably improved. Moreover, a stochastic approach was developed for modelling inter-particle collisions which were found to be quite important even for low particle mass loading. Model calculations with inter-particle collisions were validated based on large eddy simulations for a homogeneous isotropic turbulence field. The effect of inter-particle collisions on the development of a particle-laden horizontal channel flow was analysed in detail by varying particle size and mass loading. Numerical predictions were performed for pneumatic conveying in a horizontal pipe and compared with measurements by phase-Doppler anemometry in order to further validate the developed models.