Numerical study of the hydrodynamics and heat transfer characteristics of gas-solid in a slit-less rotating fluidized bed in static geometry

摘要

A rotating fluidized bed in static geometry (RFB-SG) without slits is presented in this paper as a research objective. The concept of RFB-SG is highly beneficial in numerous industrial operations such as granular drying, particle coating, mixing, agglomeration, and combustion. In this study, a three-dimensional CFD model is developed using the commercial software ANSYS FLUENT 14.5, to investigate hydrodynamics and heat transfer characteristics of gas-solid in the vortex chamber. The analysis of the flow pattern of gas-solid and the prediction of fluidization capacity have been made, using appropriate parameters. The findings showed that the significant factors, such as inlet air velocity, solid-bed thickness, the volume fraction of solids, solids pressure, and heat transfer coefficient, influenced the reactor capacity. It is observed that the solid inventories of 300 and 500 g have been fluidized perfectly at inlet air velocities of 30 m s(-1)and 44 m s(-1), respectively. The overall operating and drying costs are found to be decreased due to the reduction in fluidization air requirements.