Oscillatory granular segregation in a long drum mixer

Z. S. Khan, W. A. Tokaruk, S. W. Morris

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


Heterogeneous granular mixtures tend to segregate when tumbled in a partially filled, horizontal rotating drum. The dynamical evolution of segregation can, under certain conditions, be oscillatory. Continuum, order parameter-style models of this process posit two coupled fields which oscillate out of phase with one another. Here we examine three candidate fields, the surface concentration, the local streaming angle and the projected concentration of the subsurface core. We find that all these quantities are in phase with one another, in contradiction to a recent order parameter model.

Original languageEnglish
Pages (from-to)212-218
Number of pages7
JournalEurophysics Letters
Issue number2
StatePublished - Apr 15 2004


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