Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 25: Granular Matter / Contact Dynamics

DY 25.7: Talk

Wednesday, April 3, 2019, 11:30–11:45, H3

Dynamics of polygonal disks under vertical vibrations — •Simeon Völkel and Kai Huang — Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany

In order to elucidate the assembly of hexagonal disks into a rotator-crystal-like state upon vertical vibrations, we investigate experimentally the dynamics of a single disk under different confining conditions.

The probability distribution of the angular velocity is found to contain three peaks, one originating from clapping and two from rotation due to precession. Furthermore, the translational and rotational degrees of freedom are coupled.

The time evolution of the translational and rotational part of the kinetic energy within one vibration cycle exhibits a phase shift depending on the container height, eventually leading to a qualitative change of the particle movement. This indicates the 'micro-' origin of the dependence of the collective behavior on the vertical confinement.