J. Phys. I France 7 (1997) 737-745
Radial Segregation in a Two-Dimensional Rotating DrumChristian M. Dury and Gerald H. Ristow
Fachbereich Physik, Philipps-Universität Marburg, Renthof 6, 35032 Marburg, Germany
(Received 19 August 1996, received in final form 23 December 1996, accepted 16 January 1997)
We simulate the size segregation of a binary mixture of granular material in a half filled two-dimensional rotating drum using the discrete elements method with linear contact forces. The dynamics of the segregation process is studied in detail as function of the angular velocity of the drum. We propose an order parameter to characterize the final amount of segregation and the segregation speed which allows to compare systems of different sizes and with different material properties. We demonstrate its usefulness by investigating its time dependence as function of the angular velocity of the drum and discuss the interplay between the thickness of the flowing layer and the mean particle velocity.
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