A discrete element method study of granular segregation in non-circular rotating drums

TY - JOUR

T1 - A discrete element method study of granular segregation in non-circular rotating drums

AU - Ayeni, O. O.

AU - Wu, C. L.

AU - Joshi, J. B.

AU - Nandakumar, K.

N1 - Publisher Copyright: © 2015 Elsevier B.V.

PY - 2015/10/1

Y1 - 2015/10/1

N2 - A particle dynamics simulation of "S+D" granular systems (where size and density drive segregation simultaneously) in various irregular shaped tumblers in the rolling regime (10-4<Fr<10-2) has been performed. A new way of quantifying the state of mixing or segregation has been developed. Using this new measure of segregation (or entropy of mixing) we show that segregation is enhanced in elliptical tumblers as compared to circular ones and in rectangular tumblers as compared to square ones with the extent of enhancement determined by the aspect ratio of the tumbler. A spectral analysis of the oscillating entropy of mixing shows that in addition to the fundamental frequency of rotation of the tumbler, the evolving granular bed may exhibit harmonics corresponding to 2 times and even 3 times the fundamental frequency of rotation. We attribute this harmonic response to the drifting of the core of particles in addition to the stretching and contraction of the interface of the bed.

AB - A particle dynamics simulation of "S+D" granular systems (where size and density drive segregation simultaneously) in various irregular shaped tumblers in the rolling regime (10-4<Fr<10-2) has been performed. A new way of quantifying the state of mixing or segregation has been developed. Using this new measure of segregation (or entropy of mixing) we show that segregation is enhanced in elliptical tumblers as compared to circular ones and in rectangular tumblers as compared to square ones with the extent of enhancement determined by the aspect ratio of the tumbler. A spectral analysis of the oscillating entropy of mixing shows that in addition to the fundamental frequency of rotation of the tumbler, the evolving granular bed may exhibit harmonics corresponding to 2 times and even 3 times the fundamental frequency of rotation. We attribute this harmonic response to the drifting of the core of particles in addition to the stretching and contraction of the interface of the bed.

KW - Discrete element method

KW - Entropy

KW - Granular flow

KW - Mixing

KW - Mixing and segregation

KW - Rotating drum

UR - http://www.scopus.com/inward/record.url?scp=84934965174&partnerID=8YFLogxK

U2 - 10.1016/j.powtec.2015.06.038

DO - 10.1016/j.powtec.2015.06.038

M3 - 文章

AN - SCOPUS:84934965174

SN - 0032-5910

VL - 283

SP - 549

EP - 560

JO - Powder Technology

JF - Powder Technology

ER -