Partic. vol. 10 no. 4 pp. 444-449 (August 2012)
doi: 10.1016/j.partic.2012.03.002

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

Pei Pei^a, Kai Zhang^{b, *}, Gang Xu^b, Yongping Yang^b, Dongsheng Wen^c

kzhang@ncepu.edu.cn

Abstract

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 two-fluid 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.

Graphical abstract

Keywords

Jetting fluidized bed; Hydrodynamics; CFD; Eulerian–Eulerian model; Particle phase viscosity