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DY: Fachverband Dynamik und Statistische Physik
DY 4: Granular Matter / Contact Dynamics Part I
DY 4.5: Vortrag
Montag, 16. März 2015, 10:30–10:45, BH-N 128
The mechanism of pattern coarsening of granular mixtures in rotating drums — •Tilo Finger1, Ralf Stannarius1, and Matthias Schröter2 — 1Otto-von-Guericke-Universität Magdeburg — 2MPI für Dynamik und Selbstorganisation Göttingen
Three fundamental segregation and pattern formation processes have been reported in granular mixtures in a rotating cylindrical drum: radial segregation, axial banding and coarsening of the band pattern. While for the first effect the mechanism is well understood and for the second effect several models have been proposed, the coarsening mechanism remained unexplained so far. We reveal the mechanism for the well-known unidirectional flow between neighboring bands in an axially segregated pattern. A process of microsegregation inside each band of small particles is reported, which was so far unrecognized. On the basis of our findings, the stability of individual bands can be easily controlled by minor alternations of their composition. We suggest viable hypotheses to explain the driving force behind the flow.