The Dynamics of Granular Segregation Patterns in a Long Drum Mixer

Details The Dynamics of Granular Segregation Patterns in a Long Drum Mixer The Dynamics of Granular Segregation Patterns in a Long Drum Mixer

1998-04-28

arxiv.org/abs/patt-sol/9804004v2

Physics

Condensed Matter

Soft Condensed Matter

20 preprint pages, with 14 figures. Figs in gif format (replaced version). Submitted to Phys. Rev. E. See also http://mobydi

Scientific paper

10.1103/PhysRevE.58.6115

We have studied the early time evolution of granular segregation patterns in a horizontal rotating cylinder partially filled with a sand/salt mixture. The growth of concentration fluctuations starting from premixed initial conditions was analyzed using Fourier techniques. In one mixture, we observed generally merging dynamics in the segregated bands up to the onset of saturation. At the threshold of saturation, we found a spectrum of wavelengths with a broad peak. The peak position was nearly independent of the tube rotation rate. The overall growth rate of Fourier modes had a maximum at a particular value of the angular rotation frequency. In a slightly different mixture, we observed transient traveling waves when the larger grains were in the majority. We measured the wave speed as a function of several parameters using presegregated initial conditions to launch waves of various wavelengths.

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