Inversion of band patterns in spherical tumblers

Pengfei Chen*, Bryan J. Lochman, Julio M. Ottino, Richard M. Lueptow

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Bidisperse granular mixtures in spherical tumblers segregate into three bands: one at each pole and one at the equator. For low fill levels, large particles are at the equator; for high fill levels, the opposite occurs. Segregation is robust, though the transition depends on fill level, particle size, and rotational speed. Discrete element method simulations reproduce surface patterns and reveal internal structures. Particle trajectories show that small particles flow farther toward the poles than large particles in the upstream portion of the flowing layer for low fill levels leading to a band of small particles at each pole. The opposite occurs for high fill levels, though more slowly.

Original languageEnglish (US)
Article number148001
JournalPhysical review letters
Volume102
Issue number14
DOIs
StatePublished - Apr 6 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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