Pattern scaling in axial segregation

Christopher R.J. Charles, Zeina S. Khan, Stephen W. Morris

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14 Scopus citations


Granular tumbled frequently segregate by grain size along the axis of partially-filled, horizontal, rotating tubes. When segregation approaches saturation at the surface, a well-defined pattern of bands with wavelength λ emerges. The long-term dynamics of the pattern involves a much slower coarsening process. We characterized the initial saturated wavelength λ as a function of the diameter of the tube D for a filling fraction of 30 %, for 1.9 cm ≤ D ≤ 11.5 cm. We also studied the initial growth-rate of the bands as D varies. We find that λ/ D is not constant, but rather increases rapidly for small D. The growth-rate of bands decreases with smaller D and segregation is suppressed completely for sufficiently small D. These relatively simple features are not captured by any of the existing models of axial segregation.

Original languageEnglish
Pages (from-to)1-3
Number of pages3
JournalGranular Matter
Issue number1
StatePublished - Mar 2006


  • Pattern formation
  • Scaling
  • Segregation


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