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DY: Dynamik und Statistische Physik

DY 41: Granular matter I

DY 41.1: Vortrag

Donnerstag, 27. März 2003, 10:00–10:15, G\"OR/229

Mixing and condensation in a wet granular medium — •Dimitrios Geromichalos, Mika Kohonen, Frieder Mugele, and Stephan Herminghaus — Angewandte Physik; Uni Ulm; Albert-Einstein-Allee 11; 89069 Ulm

We have studied the effect of small amounts of added liquid on the dynamic behavior of a granular system consisting of a mixture of glass beads of two different sizes. Segregation of the large beads to the top of the sample is found to depend in a nontrivial way on the liquid content. A transition to viscoplasic behavior occurs at a critical liquid content, which depends upon the bead size. We show that this transition can be interpreted as a condensation due to the hysteretic liquid brige forces connecting the beads, and provide the corresponding phase diagram.