Regensburg 2013 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 33: Poster II

DY 33.23: Poster

Donnerstag, 14. März 2013, 17:00–19:00, Poster C

Liquid-solid-like transition in two dimensional wet granular matter — •Michael Wild, Christopher May, Ingo Rehberg, and Kai Huang — Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany

The phase transition of a monolayer of wet granular spheres under horizontally swirling motion is investigated experimentally. Due to the cohesion arising from the formation of capillary bridges between adjacent particles, the particles initially form a crystalline structure at moderate driving. By both increasing and decreasing the swirling frequency, we characterize the transitions between a crystal-like state and a liquid-like state with both local packing density and bond orientational order parameters. The hysteresis between the melting and crystallization threshold will be discussed. Moreover, the dependence of this transition on global fill fraction will be presented. In the limiting case of small crystalline structures, the critical driving frequency to mobilize those structures is found to depend strongly on the the cluster sizes, suggesting a size dependent effective static friction between the wet granular layer and the substance.