Radial and Axial Segregation of Granular Mixtures in the Rotating-Drum Geometry

2003 ◽  
pp. 181-191
Author(s):  
SANJAY PURI ◽  
HISAO HAYAKAWA
Keyword(s):  
Rotating Drum ◽  
Axial Segregation ◽  
Granular Mixtures

RADIAL AND AXIAL SEGREGATION OF GRANULAR MIXTURES IN THE ROTATING-DRUM GEOMETRY

2001 ◽  
Vol 04 (04) ◽  
pp. 469-479 ◽  
Author(s):  
SANJAY PURI ◽  
HISAO HAYAKAWA
Keyword(s):  
Surface Tension ◽  
Phenomenological Model ◽  
Dynamical Evolution ◽  
Rotating Drum ◽  
Effective Surface ◽  
Axial Segregation ◽  
Granular Mixtures ◽  
Sharp Interfaces

We formulate a phenomenological model for the dynamical evolution of granular mixtures in a rotating drum. In particular, we present a dynamical basis for an "effective surface tension," which penalizes sharp interfaces between regions enriched in different components of the mixture. We also present representative results which demonstrate that our model captures many experimental features for this problem.

scholarly journals Axial Segregation of Polydisperse Granular Mixtures in Rotating Drum Flows

Minerals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 915
Author(s):  
Elbasher Mohamed Elbasher Ahmed ◽  
Indresan Govender ◽  
Aubrey Njema Mainza
Keyword(s):  
Particle Simulation ◽  
Simulation Studies ◽  
Rotating Drum ◽  
Limited Mobility ◽  
Axial Segregation ◽  
Numerical Studies ◽  
Granular Mixtures ◽  
Common Thread ◽  
Long Time ◽  
Discrete Particle Simulation

Axial segregation of polydisperse granular mixtures in rotating drums have been observed in several experimental and discrete particle simulation studies reported in the literature. A common thread to both experimental and numerical studies is the formation of (alternating) bands which eventually coarsen in the long-time limit due to logarithmic merging. Models to explain the experimental observations are generally limited to bidisperse mixtures, and often unable to reproduce band coarsening. One such mechanism for bidisperse mixtures argues that the grains eventually diffuse into axial bands as a consequence of concentration fluctuations in the free surface layer caused by friction-limited mobility. We generalise this model to multi-species mixtures and show that the solution produces banding that evolves more complexly than binary mixtures, with sinusoidal-like variations of the band structure that evolves non-linearly in time. In addition, we successfully recover band coarsening with time—an observation that is generally difficult to reproduce, even experimentally. Contrary to literature findings, the configurations herein did not produce bands within bands for ternary and quaternary mixtures.

Particle shape-induced axial segregation of binary mixtures of spheres and ellipsoids in a rotating drum

2021 ◽  
Vol 235 ◽  
pp. 116491
Author(s):  
S.Y. He ◽  
J.Q. Gan ◽  
D. Pinson ◽  
A.B. Yu ◽  
Z.Y. Zhou
Keyword(s):  
Binary Mixtures ◽  
Particle Shape ◽  
Rotating Drum ◽  
Axial Segregation

scholarly journals The geometric axial surface profiles of granular flows in rotating drums

2021 ◽  
Vol 121 (5) ◽  
Author(s):  
Elbasher M.E. Ahmed ◽  
I. Govender ◽  
A. Mainza
Keyword(s):  
Free Surface ◽  
Surface Profile ◽  
Rotating Drum ◽  
Cross Sectional ◽  
Axial Segregation ◽  
Wide Range ◽  
Free Surface Profile ◽  
Axial Profile ◽  
Slurry Transport ◽  
Rotating Drums

SYNOPSIS A mechanistic description of axial segregation in rotating drum flows remains an open question. Consequently, optimal mixing of grinding balls and rocks for efficient breakage, maximum production of fines, and slurry transport is seldom achieved. Experimental and numerical studies of granular mixtures in rotating drums identify alternating axial bands that eventually coarsen in the long-term limit. Most models of axial segregation are limited to binary mixtures and cannot always predict the logarithmic coarsening effects observed experimentally. A key missing factor is a robust description of the axial free surface profile that is valid across a wide range of flow regimes. We present a practical model of the axial free surface profile by linking it to readily-derived geometric features of the cross-sectional S-shaped free surface profile. A parametric study shows good agreement with experimental measurements reported in the literature and heuristically valid trends. Keywords: rotating drum, granular flow, axial profile, comminution, mixing, segregation.

1013 Mechanism of axial segregation in a tapered rotating drum

2008 ◽  
Vol 2008.83 (0) ◽  
pp. _10-13_
Author(s):  
Yuta EMURA ◽  
Hirotaka YADA ◽  
Toshihiro KAWAGUCHI ◽  
Takuya TSUJI ◽  
Toshitsugu TANAKA
Keyword(s):  
Rotating Drum ◽  
Axial Segregation

A study of the axial segregation in a rotating drum using deformable particles

2006 ◽  
Vol 166 (3) ◽  
pp. 161-166 ◽  
Author(s):  
H.P. Kuo ◽  
Y.C. Hsiao ◽  
P.Y. Shih
Keyword(s):  
Rotating Drum ◽  
Axial Segregation ◽  
Deformable Particles

Coarsening of axial segregation patterns of slurries in a horizontally rotating drum

2006 ◽  
Vol 74 (3) ◽  
Author(s):  
Tilo Finger ◽  
Andreas Voigt ◽  
Jörg Stadler ◽  
Heiko G. Niessen ◽  
Lama Naji ◽  
...  
Keyword(s):  
Rotating Drum ◽  
Axial Segregation

Continuum theory of axial segregation in a long rotating drum

1999 ◽  
Vol 60 (2) ◽  
pp. 1975-1987 ◽  
Author(s):  
I. S. Aranson ◽  
L. S. Tsimring ◽  
V. M. Vinokur
Keyword(s):  
Continuum Theory ◽  
Rotating Drum ◽  
Axial Segregation
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