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DY: Fachverband Dynamik und Statistische Physik
DY 31: Granular matter / contact dynamics II
DY 31.7: Talk
Friday, March 30, 2007, 11:45–12:00, H2
Axial transport of granular materials in a rotating drum — Khan Zeina S.1 and •Morris Stephen W.2 — 1Max Plank Institute for Dynamics and Self-Organization, Goettingen, Germany — 2University of Toronto, Department of Physics, Toronto, Canada
Bidisperse granular mixtures rapidly segregate by size when tumbled in a partially filled horizontal rotating drum. The smaller grains move radially towards the axis of rotation and form a buried radial core. On a longer time scale, modulations of the radial core may grow into axial bands. Using a narrow pulse of the smaller component as an initial condition, we observe that the axial transport of the radial core is a subdiffusive front advencement process. By colouring some of the larger grains, we also find that the mixing and axial transport is subdiffusive. We also report on the effects of changing the relative grain size and drum diameter on the axial transport of grains.