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

O. O. Ayeni, C. L. Wu*, J. B. Joshi, K. Nandakumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)549-560
Number of pages12
JournalPowder Technology
Volume283
DOIs
StatePublished - 1 Oct 2015
Externally publishedYes

Keywords

  • Discrete element method
  • Entropy
  • Granular flow
  • Mixing
  • Mixing and segregation
  • Rotating drum

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