(210e) Numerical Study of Fluidization of Binary Mixture of Particles Using SOMKTGF-MP

The second-order moment of kinetic theory of granular flow (SOM-KTGF) has been verified in predicting the particle-laden flow in the median concentration, by the four-way coupled second-order method (FW-SOM) established via coupling the gas phase second-order turbulence model [1]. The anisotropic SOM-KTGF remedied the shortage of the classic isotropic KTGF in predicting the “dilute” phase of particles in the fluidized risers. These particles of the dilute phase in the fluidized bed were suspended in the reactor and less affected by the other particles surrounded. As a result, these particles show high inertia and high anisotropic behavior in the fluctuation of the particle velocity. In the previous study, the FW-SOM and SOM-KTGF showed superior to the classic KTGF in the numerical study of fluidization.

A novel model of the SOM-KTGF for multi-type particles (SOM-KTGF-MP) was proposed in this study to investigate the fluidization of the particle mixture with binary types. The particles in the mixture differ in all types of physical properties such as density, size restitution coefficient et al. In the model, SOM-KTGF-MP, the conservation equations of the volume fraction, velocity, and the velocity fluctuation of particles were solved for each type of particle. In this study, SOM-KTGF-MP was applied to simulate the flow behavior of gas-solid flow with different sizes and densities of particles in the fluidized bed. The anisotropic fluctuation of the binary types of particles and the effects of the particle-particle interaction is investigated in terms of the particle distribution and turbulent characteristics.

[1] D. Sun. Four-way coupled second-order method of two-fluid model for gas-particle flow and the numerical simulation in horizontal channels. Powder Technology 390 (2021) 354–368