An EMMS Flow Model of Gas–Liquid–Solid Fluidized Bed with Dual Size Bubbles

Abstract

A flow model for the gas–liquid–solid circulating fluidized bed with a mesoscale flow structure has been established. Empirical correlations are applied to validate the bubble hydrodynamics calculated by the energy-minimization multiscale model. The gas–liquid–solid fluidized bed is divided into different phases, and is analyzed through the energy consumed in transporting and suspending the particles in the system as the stability criteria, Nst → min. The effects of drag coefficient models are also examined on the hydrodynamic parameters. Bubble hydrodynamics is profoundly reliant upon drag coefficient calculation. The current study inspected a correlation for the drag coefficient and expects to look at the most successful models accessible and how they fit the experimental data. The model prediction is tested with experimental results that cover a wide range of the operating conditions available in the literature, and good agreement between model predictions and experiments is obtained. The results show that drag coefficient has a profound effect on the bubble hydrodynamics, and the new EMMS model gives the best agreement to the experimental data.