COMPUTATION OF PARTICLE DISPERSION IN TURBULENT LIQUID FLOWS USING ANEFFICIENT LAGRANGIAN-TRAJECTORY MODEL

The dispersion of solid particles in a turbulent liquid flow impinging on a centrebody through an axisymmetric sudden expansion was investig ated numerically using a Eulerian-Lagrangian model. Detailed experimen tal measurements at the inlet were used to specify the inlet condition s for two-phase flow computations. The anisotropy of liquid turbulence was accounted for using a second-moment Reynold stress transport mode l. A recently developed stochastic-probabilistic model was used to enh ance the computational efficiency of Lagrangian trajectory computation s. Numerical results of the stochastic-probabilistic model using 650 p article trajectories were compared with those of the conventional stoc hastic discrete-delta-function model using 18 000 particle trajectorie s. In addition, results of the two models were compared with experimen tal measurements. (C) 1998 John Wiley & Sons, Ltd.