Dresden 2011 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 40: Posters II
DY 40.27: Poster
Donnerstag, 17. März 2011, 17:00–19:00, P3
Coarsening in granular segregation, an entropic approach — •Tilo Finger1, Matthias Schröter2, and Ralf Stannarius1 — 1Otto-von-Guericke-University-Magdeburg — 2MPI for Dynamics and Self-organization Göttingen
When one fills a binary mixture in a cylindrical drum, one observe size segregation after agitation by horizontal rotation. This experiment has become a classic in granular physics. Segregation takes place on different time scales. At first, a radial segregation of the large and small particles is observed. This process is often followed by an axial segregation into band patterns. Gradual merging of the bands leads to an almost complete demixing on long time scales [1]. So far, the nature of this coarsening process is not understood. Here we present an X-ray tomography study where we visualize the tree-dimensional particle distribution in the cylinder. Our experiments aim at the confirmation of an increase of configurational entropy [2] during the coarsening process.
[1] T. Finger et al., PRE 74, 031312 (2006)
[2] S.F. Edwards & R.B.S. Oakeshott, Physica A 157, 1080 (1989)