Dresden 2011 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 1: Focus Session: Dense Granular Flow

DY 1.6: Hauptvortrag

Montag, 14. März 2011, 13:00–13:30, HÜL 186

Convection and segregation of granular mixtures in almost filled containers — •Ralf Stannarius and Frank Rietz — Otto-von-Guericke-Universität Magdeburg, Institut für Experimentalphysik

When the free volume of granular material in a closed container goes to zero, dynamical degrees of freedom become more and more restricted, the system jams. Finally, agitation with external forces does no longer change the compact granulate structure. Interestingly, during this transition qualitatively new dynamical phenomena are observed. Slow processes become effective [1] that are otherwise absent or masked in containers with low fill level. They dominate dynamical processes and restructuring in almost full containers. We describe convection and segregation phenomena and their complex mutual interrelations. Respective to shaken containers with high fluidization, different symmetries of the dynamical structures as well as new coupling effects between segregation and dynamics are found.

[1] F. Rietz and R. Stannarius, Phys. Rev. Lett. 100, 078002 (2008).