Modeling of the hydrodynamics of the fully developed region in a downer reactor

A mathematical model is developed to describe the hydrodynamics of the fully developed region in a downer reactor. The model is based on the energy-minimization and multi-scale (EMMS) principle. The influence of the friction coefficient, the solid flow rate and the superficial gas velocity on the flow pattern in the downer is simulated. The local solid concentration and gas/solid velocities are predicted. The model results show a good agreement with experimental data in literatures. In addition, cluster size and local slip velocity are discussed.