Abstract:

A novel variable-scale model is proposed based on lattice gas automata（LGA）to describe the macroscopic behavior through microscopic gas-solid interactions. Flow field is divided into two-deck hexagon lattices of different scales，solid particles and gas pseudo-particles are aligned in the lattices for solid and gas. In addition to basic LGA rules，additional rules of collision and propagation are specifically designed for the gas-solid system. A statistical method of macroscopic properties and the conversion of model parameters with hydrodynamic properties are established. Simulations for the dynamic behavior of gas-solid two phase flow in a fluidized bed with one layer of louver baffle based on this model show good agreements with the experimental results in literature. These calculated results show that the model is feasible and can be efficiently used in engineering community.