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DY: Dynamik und Statistische Physik

DY 44: Granular Systems

DY 44.5: Vortrag

Donnerstag, 11. März 2004, 15:45–16:00, H2

Horizontal brazil nut effects in a swirled bowl — •Tobias Schnautz¹, Christoph Kruelle¹, Ricardo Brito² und Ingo Rehberg¹ — ¹Experimentalphysik V, Universitaet Bayreuth, D-95440 Bayreuth, Germany — ²Dep. Fisica Aplicada I, Universidad Complutense, 28040- Madrid, Spain

We present both, the behavior of a monodisperse layer of spheres, rolling on a circularly vibrating table, and experimental results on on the segregation of a binary mixture of spheres. When increasing the filling fraction, a monodisperse layer of spheres shows two transitions between states characterized by a different mobility of particles. The critical particle densities for the liquid-solid transition are found to be independent of the driving frequency, but decrease with increasing vibration amplitude. Depending on the material properties, segregation occurs in the liquid-like and in the solid-like state. The particle velocity distributions show a transition from two peaks, located symmetrically around zero, to one single peak at zero. The experimental results are compared with a simplified two- dimsnional model system.