Traveling Granular Segregation Patterns in a Long Drum Mixer

Details Traveling Granular Segregation Patterns in a Long Drum Mixer Traveling Granular Segregation Patterns in a Long Drum Mixer

1997-06-27

arxiv.org/abs/cond-mat/9706288v2

Physical Review Letters, vol. 79, p. 2975 (1997).

Physics

Condensed Matter

Soft Condensed Matter

11 pages

Scientific paper

10.1103/PhysRevLett.79.2975

Mixtures of granular media often exhibit size segregation along the axis of a partially-filled, horizontal, rotating cylinder. Previous experiments have observed axial bands of segregation that grow from concentration fluctuations and merge in a manner analogous to spinodal decomposition. We have observed that a new dynamical state precedes this effect in certain mixtures: bi-directional traveling waves. By preparing initial conditions, we found that the wave speed decreased with wavelength. Such waves appear to be inconsistent with simple PDE models which are first order in time.

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