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A USM-\(\Theta \) two-phase turbulence model for simulating dense gas-particle flows. (English) Zbl 1202.76070
Summary: A second-order moment two-phase turbulence model for simulating dense gas-particle flows (USM-\(\Theta\) model), combining the unified second-order moment two-phase turbulence model for dilute gas-particle flows with the kinetic theory of particle collision, is proposed. The interaction between gas and particle turbulence is simulated using the transport equation of two-phase velocity correlation with a two-time-scale dissipation closure. The proposed model is applied to simulate dense gas-particle flows in a horizontal channel and a downer. Simulation results and their comparison with experimental results show that the model accounting for both anisotropic particle turbulence and particle-particle collision is obviously better than models accounting for only particle turbulence or only particle-particle collision. The USM-\(THgr\) model is also better than the \(k-\varepsilon -kp-\Theta\) model and the \(k-\varepsilon-kp-\varepsilon p-\Theta\) model in that the first model can simulate the redistribution of anisotropic particle Reynolds stress components due to inter-particle collision, whereas the second and third models cannot.

MSC:
76F25 Turbulent transport, mixing
76T15 Dusty-gas two-phase flows
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