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Segregation pattern competition in a thin rotating drum

I. Zuriguel1,2,*, J. Peixinho2,3, and T. Mullin2

  • 1Departamento de Física y Matemática Aplicada, Universidad de Navarra, Pamplona 31008, Spain
  • 2Manchester Centre for Nonlinear Dynamics, University of Manchester, Manchester M139PL, United Kingdom
  • 3Benjamin Levich Institute and Department of Chemical Engineering, City College of City University of New York, New York, New York 10031, USA

  • *iker@fisica.unav.es
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Phys. Rev. E 79, 051303 – Published 14 May, 2009

DOI: https://doi.org/10.1103/PhysRevE.79.051303

Abstract

Results are presented of an experimental investigation into patterned size segregation of binary granular mixtures in a thin rotating drum that is half full. It is observed that streaks of small particles are formed within regions of large ones where the integer number of streaks is fixed over a range of rotation rate of the drum. Different patterns form in adjacent parameter ranges and the dynamics associated with the exchange between neighboring states is analyzed using angular spatiotemporal diagrams. These help to reveal properties of the merging mechanism for streaks of small particles. We report experimental evidence that the merging of streaks is mediated by the movement of a surplus material in a direction opposite to that of the rotation of the drum. The excess material is distributed throughout the pattern and the extra streak eventually disappears.

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Phys. Rev. E 79, 051303– Published 14 May, 2009
  • Received 13 January 2009

© 2009 American Physical Society

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