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CFD simulation of air-water in a spouted bed

Abstract:

Computational fluid dynamics (CFD) is employed to simulate the air-water system in a spouted column with a draft tube. Numerical results of Reynolds-averaged Navier-Stokes (RANS) equations using the k-ε and k-ω two-equation turbulence models are compared with Pironti at al. (1995) experimental data. CFD pbkp_redictions of the k-εand k-ω turbulence models are in good agreement with the reported experimental data. The interfacial momentum transfer in modeling air-water system in the spouted bed indicated the importance of using turbulent dispersion force besides the most often used drag and lift forces to better pbkp_redict flow behavior and air hold-up. Ishii-Zuber liquid-gas drag model with the lift and turbulent dispersion forces yields very good results; it correctly determines a hold up within 1% when used along with the k-εturbulence model, while it under-pbkp_redicts the hold-up by 4.08% when used with the k-ω model. © 2011, AIDIC Servizi S.r.l.