Particle segregation in a spouted bed of binary mixtures of particles

We consider the evolution of particle segregation in collisional flows of two types of spheres down rigid bumpy inclines in the absence of sidewalls. We restrict our analysis to dense flows and use an extension of kinetic theory to predict the concentration of the mixture and the profiles of mixture velocity and granular temperature. A kinetic theory for a binary mixture of nearly elastic spheres that do not differ by much in their size or mass is employed to predict the evolution of the concentration fractions of the two types of spheres. We treat situations in which the flow of the mixture is steady and uniform, but the segregation evolves, either in space or in time. Comparisons of the predictions with the results of discrete numerical simulation and with physical experiments are, in general, good.

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Extension and validation of the particle segregation model for bubbling gas-fluidized beds of binary mixtures

Chemical Engineering Science ◽

10.1016/j.ces.2013.04.012 ◽

2013 ◽

Vol 97 ◽

pp. 139-151 ◽

Cited By ~ 26

Author(s):

Francesco P. Di Maio ◽

Alberto Di Renzo ◽

Vincenzino Vivacqua

Keyword(s):

Binary Mixtures ◽

Fluidized Beds ◽

Particle Segregation ◽

Gas Fluidized Beds

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Fluid Dynamic Behavior in a Spouted Bed with Binary Mixtures Differing in Size

Drying Technology ◽

10.1080/07373937.2015.1036284 ◽

2015 ◽

Vol 33 (14) ◽

pp. 1746-1757 ◽

Cited By ~ 12

Author(s):

K. G. Santos ◽

M. C. C. Francisquetti ◽

R. A. Malagoni ◽

M. A. S. Barrozo

Keyword(s):

Dynamic Behavior ◽

Binary Mixtures ◽

Fluid Dynamic ◽

Spouted Bed

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CFD Simulation of Spouted Bed Working with a Size Distribution of Sand Particles: Segregation Aspects

Materials Science Forum ◽

10.4028/www.scientific.net/msf.899.95 ◽

2017 ◽

Vol 899 ◽

pp. 95-100

Author(s):

Kássia Graciele dos Santos ◽

L.V. Ferreira ◽

Ricardo Correa Santana ◽

Marcos Antonio de Souza Barrozo

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Cfd Simulation ◽

Computational Simulation ◽

Particle Diameter ◽

Spouted Bed ◽

Particle Segregation ◽

Cfd Method ◽

Mean Particle Diameter

Spouted bed simulations are usually performed using only one granular phase with a mean particle diameter representing the entire particle mixture, instead of a particle size distribution. In this study, the effect of the particle size distribution is accounted through the simulation of a mixture with five granular phases. The results showed that the particle segregation occurs. Larger particles are more concentrated in the upper region, while the smaller particles are preferably positioned in the lower region of the bed. Computational simulation using CFD method reproduced well the segregation experiments with different participle sizes of sand.

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