Hydrodynamics of slot-rectangular spouted beds: Process intensification

[Display omitted] •Effect of bed geometry is studied on hydrodynamics of slot-rectangular spouted bed.•A novel Ums correlation is proposed for slot-rectangular spouted beds.•A novel curved bottom spouted bed is proposed.•Curved bottom bed shows better solid circulation properties. Effect of bed geom...

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Bibliographic Details
Published in:Chemical engineering research & design 2017-05, Vol.121, p.315-328
Main Authors: Golshan, Shahab, Zarghami, Reza, Mostoufi, Navid
Format: Article
Language:English
Subjects:
Angles (geometry)
Axial flux
Beds (process engineering)
CFD-DEM
Circulation
Fluid dynamics
Fluid flow
Fluid mechanics
Flux
Hydrodynamics
Particle motion
Process intensification
Simulation
Slot-rectangular bed
Solid circulation
Spouted bed
Spouted beds
Velocity
Velocity distribution
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Summary:[Display omitted] •Effect of bed geometry is studied on hydrodynamics of slot-rectangular spouted bed.•A novel Ums correlation is proposed for slot-rectangular spouted beds.•A novel curved bottom spouted bed is proposed.•Curved bottom bed shows better solid circulation properties. Effect of bed geometry on the hydrodynamics of slot-rectangular spouted beds was studied by means of CFD-DEM simulations. Axial and lateral velocity distributions of particles as well as axial gas velocity distribution were used for validation of the simulation with experimental data. Static bed height and U0/Ums were constant in all simulations. Minimum spouting velocity as well as velocity, voidage and axial flux distributions of particles were determined and compared for six bed cone angles (20°–70°). An improved correlation for minimum spouting velocity was proposed which includes the effect of bed cone angle for the first time. Novel curved bed geometry, inspired from improvement of particle motion, was also proposed. Solids circulation rates for beds with different cone angles were evaluated by tracing sample particles in the bed. Axial distribution of lateral solids flux, which shows the insertion location of particles from annulus to spout, was determined for different cone angles. Combination of solids circulation rate (speed of circulation) and lateral flux (quality of circulation) was used to discuss about the effect of geometry on the circulation of particles. The best circulation behavior was observed in the curved bed.
ISSN:0263-8762
1744-3563
DOI:10.1016/j.cherd.2017.03.022