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Effects of scale and inertia on granular banding segregation

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Abstract.

We report that the formation of much reported axial segregation bands in rotating cylinders loaded with different sized particles depends critically on scale and inertia. Specifically, when the ratio, δ, of the diameter of the cylinder to the average diameter of the particles is large, axial bands invariably appear, when δ is small, bands never appear, and between these extremes lies a reversible state where the presence or absence of bands depends on container rotation speed. Our results indicate that banding is associated with a Rayleigh-like instability of a granular core of fine particles, and that this instability is controlled by the inertia of the larger species – and consequently on scale.

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Authors and Affiliations

  1. Department of Chemical and Biochemical Engineering, Rutgers University, Piscataway, NJ, 08855, USA

    A. Alexander & F. J. Muzzio

  2. Department of Biomedical Engineering, Rutgers University, Piscataway, NJ, 08855, USA

    T. Shinbrot

Authors
  1. A. Alexander
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  2. F. J. Muzzio
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  3. T. Shinbrot
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Correspondence to T. Shinbrot.

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KeywordsGranular, Segregation, Mixing, Banding, Scale

PACS number(s): 05.40.+j, 46.10.+z, 83.10.Hh.

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Alexander, A., Muzzio, F. & Shinbrot, T. Effects of scale and inertia on granular banding segregation. GM 5, 171–175 (2004). https://doi.org/10.1007/s10035-003-0141-y

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  • DOI: https://doi.org/10.1007/s10035-003-0141-y

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