Berlin 2005 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.97: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

Segregation effects in a swirled bowl — •T. Schnautz¹, C.A. Krülle¹, I. Rehberg¹, and R. Brito² — ¹Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth — ²Fisica Aplicada I, Universidad Complutense, E-28040 Madrid

We present experimental results on the segregation of a binary mixture of spheres. These are compared with the results of a numerical simulation of sliding disks with additional sphere characteristics. Depending on the filling fraction in the system a monodisperse layer of spheres shows a "plastic"-liquid-like, and a liquid-solid-like phase transition. At slightly higher densities segregation effects, similar to the Brazil-nut effect and its reverse, occur for binary mixtures. So a phase transition seems to be a precondition for segregation. These critical particle densities are both found to be independent of the driving frequency, but decrease with increasing vibration amplitude.