Comparative analysis of CFD models for jetting fluidized beds:Effect of particle-phase viscosity

Under the Eulerian-Eulerian framework of simulating gas-solid two-phase flow,the accuracy of the hydrodynamic prediction is strongly affected by the selection of rheology of the particulate phase,for which a detailed assessment is still absent.Using a jetting fluidized bed as an example,this work investigates the influence of solid rheology on the hydrodynamic behavior by employing different particle-phase viscosity models.Both constant particle-phase viscosity model(CVM)with different viscosity values and a simple two-fluid model without particle-phase viscosity(NVM)are incorporated into the classical twofluid model and compared with the experimental measurements.Qualitative and quantitative results show that the jet penetration depth,jet frequency and averaged bed pressure drop are not a strong function of the particle-phase viscosity.Compared to CVM,the NVM exhibits better predictions on the jet behaviors,which is more suitable for investigating the hydrodynamics of gas-solid fluidized bed with a central jet.