Simulation of swirling gas-particle flows using USM and k-epsilon-kp two-phase turbulence models

The turbulent swirling gas-particle flows with swirl numbers 0.47 and 1.5 a re simulated using a unified second-order moment (USM) (two-phase Reynolds stress equations) and a k-epsilon -kp two-phase turbulence models. The resu lts are compared with experiments. Both two models can well predict the axi al time-averaged two-phase velocities in case of s = 0.47, but the USM mode l is better than the k-epsilon -kp model in predicting the tangential time- averaged two-phase velocities of strongly swirling flows (S = 1.5). The ani sotropic two-phase turbulence can well be described only using the USM mode l. The results give the difference in flow behavior between weakly swirling and strongly swirling gas-particle flows. (C) 2001 Elsevier Science S.A. A ll rights reserved.