Long lasting instabilities in granular mixtures

Details Long lasting instabilities in granular mixtures Long lasting instabilities in granular mixtures

2003-03-18

arxiv.org/abs/cond-mat/0303335v1

Physica A 326 (3-4): 313-321 Aug. 15 2003

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 10 figures, (2002)

Scientific paper

10.1016/S0378-4371(03)00275-9

We have performed experiments of axial segregation in the Oyama's drum. We have tested binary granular mixtures during very long times. The segregation patterns have been captured by a CCD camera and spatio-temporal graphs are created. We report the occurence of instabilities which can last several hours. We stress that those instabilities originate from the competition between axial and radial segregations. We put into evidence the occurence of giant fluctuations in the fraction of grain species along the surface during the unstable periods.

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