Dresden 2011 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 22: Granular Matter/ Contact Dynamics

DY 22.5: Vortrag

Mittwoch, 16. März 2011, 15:00–15:15, HÜL 186

Phase transitions of two dimensional wet granular matter under swirling motion — •Christopher May, Kai Huang, and Ingo Rehberg — Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth, Germany

Wetting triggered phase transitions of granular matter may lead to natural disasters such as landslide. To shed light on phase transitions of wet granular matter in general, we study experimentally the dynamical behavior of two dimensional wet glass beads under horizontal swirling motion. The cohesion induced by capillary bridges formed between adjacent particles tends to keep wet granular clusters rigid against 2D swirling motion. How the rigidity varies with wetting liquid added and how the change of rigidity in turn influences the phase transitions of the 2D system are going to be addressed. The structures of the clusters are investigated by particle tracking techniques and their solid-, fluid- and gaslike states are characterized by means of bond-orientational order parameters.