Particle scale modelling of gas-solid flow in a fluid bed reactor: comparison with the experiments

摘要

This paper describes a Combined Continuum and Discrete Model (CCDM) capable of simulating gas-solid two-phase flow at individual particle level, with special reference to its validation. Both numerical and physical experiments were conducted under comparable conditions, with the later involving the use of a high-speed digital video camera. The results show that the model predictions from the first principles are in good agreement with the experiments. The complex solid flow patterns caused by the lateral gas blasting and associated to either raceway or fluidization phenomena were captured well by the model. The capability of the proposed CCDM is further highlighted by its depicted microdynamic information about the spatial distributions of particle-particle and fluid-particle interactions, which is key to elucidating the mechanisms governing the gas-solid two-phase flow.