CFD simulation of flow pattern and jet penetration depth in gas-fluidized beds with single and double jets

摘要: Abstract A simple two-fluid model is validated by comparing single-jet fluidization experiments and numerical predictions. Subsequently, flow pattern jet penetration depth are explored numerically in the bed with double jets under equal unequal gas velocities. Glass balltoni a density of 2550 kg/m 3 diameter 275 μm employed as solid phase. The used this study considers effect dispersed phase on both particle momentum equations inviscid ( Gidaspow, 1994 ). Numerical simulations carried out platform CFX 4.4, commercial CFD code, together user-defined FORTRAN subroutines. Both frequency predicted good quantitative agreement measurements an incipiently fluidized single jet. By combining volume fraction distribution particle-phase velocity vector profile, three patterns (isolated, merged transitional jets) identified gas-fluidized jets, which depend more nozzle distance than velocity. For velocity, decreases increasing merged-jet transitional-jet regions, then reaches minimum value region, finally keeps steady isolated-jet region. increases increase one other fixed, whilst depths change little region remain constant