Comparison of numerical simulations and experiments in conical gas–solid spouted bed

Flow behavior of gas and particles in conical spouted beds is experimentally studied and simulated using the two-fluid gas–solid model with the kinetic theory of granular flow. The bed pressure drop and fountain height are measured in a conical spouted bed of 100 mm I.D. at different gas velocities. The simulation results are compared with measurements of bed pressure drop and fountain height. The comparison shows that the drag coefficient model used in cylindrical beds under-predicted bed pressure drop and fountain height in conical spouted beds due to the partial weight of particles supported by the inclined side walls. It is found that the numerical results using the drag coefficient model proposed based on the conical spouted bed in this study are in good agreement with experimental data. The present study provides a useful basis for further works on the CFD simulation of conical spouted bed.

From experiments, the fountain can be clearly visualized and the spouting is stably established. At the same time, the flow pattern of conical spouted beds including three regions, the spout in the center, the fountain above the bed surface, and the annulus between the spout and the wall, is clearly observed from simulations.Figure optionsDownload as PowerPoint slide