Computational fluid dynamics and experimental study of the hydrodynamics of a gas–solid tapered fluidized bed

Abstract

a b s t r a c tIn the present work, experimental and numerical studies for the hydrodynamics in a gassolid tapered fluidized bed have been carried out. The experimental results obtained by carrying out experiments in a tapered fluidized bed for glass bead (spherical) of 2.0 mm and dolomite (non-spherical particles) of 2.215 mm in diameter, were compared with the computational fluid dynamics (CFD) simulation results, using a commercial CFD software package, Fluent. The gas-solid flow was simulated using the Eulerian-Eulerian model and applying the kinetic theory of granular flow for solid particles. The Gidaspow drag model was used to calculate the gas-solid momentum exchange coefficients. Pressure drops predicted by the CFD simulations agreed reasonably well with experimental measurements for both types (spherical and non-spherical) of particles. Good agreement was also obtained between experimental and CFD predicted bed expansion ratios for both types of particles. Present study provides a useful basis for further works on the CFD of tapered fluidized bed.

Understanding and modeling retention of mammalian cells in fluidized bed centrifuges

“…The density of both live and dead cells was assumed to be 1050 kg/m 3 , as reported for other mammalian cell lines . Similar to other recent fluidized bed CFD models, a two‐fluid modeling approach using the Kinetic Theory of granular flow was used to describe the particle phase stresses. Kinetic viscosity and drag force were estimated using the expression developed by Gidaspow, and solid bulk viscosity was estimated using the method used by Lun .…”

Hydrodynamic studies on fluidization of Red mud: CFD simulation

“…Hydrodynamic behaviors of nonreactive gas-solid fluidized bed reactor are investigated by using multi fluid Eulerian model where the effects of particle size and superficial gas velocity are studied by researchers [9,10]. Hydrodynamics of a gas-solid tapered fluidized bed with CFD simulations are reported [11]. Simulation for minimum fluidization velocity, bubbling velocity and slugging velocity are studied for four types of Geldart particles by Labview method [12].…”

Hydrodynamics of binary mixtures in a tapered gas–solid fluidized bed

“…When fine particles of biomass are used, on the other hand, the feed must be introduced lower in the bed; otherwise, the fines are quickly entrained out of the bed before the completion of pyrolysis . These disadvantages can be overcome by employing a tapered bed, which has been used in a few other industrial processes including coal conversion, immobilized biofilm reaction and wastewater treatment …”