Traveling Granular Segregation Patterns in a Long Drum Mixer

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 ob...

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Bibliographic Details
Published inarXiv.org
Main Authors Choo, Kiam, Molteno, T C A, Morris, Stephen W
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 04.09.1997
Subjects
Granular materials
Granular media
Initial conditions
Rotating cylinders
Size determination
Spinodal decomposition
Traveling waves
Variation
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.9706288