Characterization of Mixing and Size Segregation in a Rotating Drum by a Particle Tracking Method

The mechanisms of segregation in solids mixing, even in simple rotating drums, are not clearly understood. Although most past studies have focused on binary mixtures, this work investigates the effect of polydispersity on granular flow, mixing, and segregation in a rotating drum operated in rolling...

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Bibliographic Details
Published in:AIChE journal 2013-06, Vol.59 (6), p.1894-1905
Main Authors: Alizadeh, Ebrahim, Dubé, Olivier, Bertrand, François, Chaouki, Jamal
Format: Article
Language:English
Subjects:
axial dispersion
Beads
Chemical engineering
Dispersion
Dispersions
Flow velocity
Mathematical models
Particle tracking
Particle trajectories
Radioactive materials
radioactive particle tracking
residence time
Rotating
rotating drum
segregation
Segregations
Shells
solid mixing
velocity profile
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Summary:The mechanisms of segregation in solids mixing, even in simple rotating drums, are not clearly understood. Although most past studies have focused on binary mixtures, this work investigates the effect of polydispersity on granular flow, mixing, and segregation in a rotating drum operated in rolling regime through particle trajectories obtained from the radioactive particle tracking technique. Velocity profiles, radial segregation, and axial dispersion coefficients for monodisperse and polydisperse systems of glass beads are analyzed with respect to rotational speed and particle size. A model is introduced to predict the residence times along streamlines and evaluate the rate at which the material renews at the free surface and within the inner layers of the bed. Our results reveal similar velocity profiles and residence times for monodisperse and polydisperse systems. They also indicate that the particles distribute along the radial direction of the drum, although not necessarily in a core/shell configuration. © 2012 American Institute of Chemical Engineers AIChE J, 59: 1894–1905, 2013
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.13982