A study of the mixing and segregation mechanisms in the Bohle Tote blender via DEM simulations

P. E. Arratia, Nhat hang Duong, F. J. Muzzio, P. Godbole, S. Reynolds

Research output: Contribution to journalArticlepeer-review

95 Scopus citations

Abstract

The flow of spherical particles in a tumbling blender is investigated using discrete element methods (DEM). Simulations are performed on a collection of particles that are mono-disperse and bi-disperse in size. The mono-disperse system is primarily used to assess the quality of mixing as a function of fill level and time. Results reveal that radial convection is faster than axial dispersion transport. This slow dispersive process hinders mixing performance in this geometry. We also find that both axial dispersion and radial convection worsen as the blender fill level is increased. This trend is corroborated by recent laboratory experiments performed in an identical geometry. Particle velocity profiles indicate that the flow is composed of two regions: i) a high velocity layer cascading atop ii) a nearly 'solid body' rotation region. Segregating mechanisms are investigated using bi-disperse systems, which show that small particles segregate in pockets at both extremes of the axis of rotation.

Original languageEnglish (US)
Pages (from-to)50-57
Number of pages8
JournalPowder Technology
Volume164
Issue number1
DOIs
StatePublished - May 4 2006

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

Keywords

  • Granular materials
  • Mixing
  • Molecular dynamics
  • Segregation
  • Tote blender

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