COMPUTATION OF DISPERSED TURBULENT LIQUID-PARTICLE FLOWS IMPINGING A CENTERBODY USING AN IMPROVED LAGRANGIAN STOCHASTIC-MODEL

A computational study is carried out for a dilute turbulent liquid-par ticle flow impinging a centerbody through a sudden-expansion pipe. An improved Lagrangian stochastic particle-dispersion model and a second- moment Reynolds-stress transport model are used for the dispersed and continuous phases, respectively. Complete initial conditions obtained from the experimental measurements are used to specify the two-phase f low conditions at the inlet. Detailed experimental measurements of bot h the liquid- and particle-phases at several downstream stations are e mployed to validate numerical predictions by comparing the predicted a nd measured radial profiles of such two-phase flow properties as mean and fluctuating velocities, mass fluxes, and mean diameters. In additi on, the problem of correcting artificial accumulation is also addresse d. It is found that numerical predictions obtained with the improved p article-dispersion model are in reasonable agreement with experimental measurements. Copyright (C) 1997 Elsevier Science Ltd.