Dresden 2011 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 22: Granular Matter/ Contact Dynamics
DY 22.2: Talk
Wednesday, March 16, 2011, 14:15–14:30, HÜL 186
Axial segregation and convection of a granular mixture in a quasi-2d rotating container — •Frank Rietz and Ralf Stannarius — Universität Magdeburg, Abt. Nichtlineare Phänomene
A bimodal mixture of glass spheres is filled into a long, flat rectangular container. The flatness of the container allows the particles to arrange only in a quasi 2d layer. The cell is slowly rotated along the horizontal axis. We observe in most cases demixing of the beads in lateral bands. In some cases the mixture does not segregate and the beads circulate in convection patterns. With this simple system we can reproduce well-known three-dimensional phenomena like axial segregation banding in half filled rotated cylinders1 and convection rolls in flat rotated cells2. By reducing the complexity from 3d to 2d we show that models based on the angle of repose are not relevant for 2d cells and thus might be not relevant in general.
[1] K.M. Hill, A. Caprihan, and J. Kakalios, Phys. Rev. Lett. 78, 50 (1997).
[2] F. Rietz and R. Stannarius, Phys. Rev. Lett. 100, 078002 (2008).