Abstract
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.
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Charles, C., Khan, Z. & Morris, S. Pattern scaling in axial segregation. Granular Matter 8, 1–3 (2006). https://doi.org/10.1007/s10035-005-0208-z
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DOI: https://doi.org/10.1007/s10035-005-0208-z