Dresden 2014 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 18: Granular Matter / Contact Dynamics

DY 18.4: Talk

Wednesday, April 2, 2014, 10:15–10:30, ZEU 118

Clustering of spinning wet granular hexagons in two dimensions — •Kai Huang and Ingo Rehberg — Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany

In order to have a more general understanding of the dynamics of wet granular matter, a consideration to the shape of particles is necessary and of practical importance, since spherical particles rarely exist in nature. With a monolayer of vertical agitated wet granular particles with a hexagonal shape, we demonstrate experimentally how the shape of particles influence the collective motion. The particles are covered with a thin liquid film so that short ranged cohesive force may arise from the formation of capillary bridges between adjacent particles. In contast to agitated spherical particles, the hexagonal shaped particles exhibit a strong tendency to spin around its vertical axis, i.e., acting as self-propelled rotors. This type of self-propelled motion is found to hinder the binding of particles through the formation of capillary bridges and hence give rise to dramatically different dynamics towards clustering and crystallization of the particles. The time evolution toward various non-equilibrium steady states of such a granular system and a phase diagram of the steady state with varying agitation parameters and area fractions will be presented.