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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.91: Poster

Monday, March 7, 2005, 15:30–18:00, Poster TU D

Condensation of granular matter in a vertical shaker — •C.-H. Tai and C.A. Krülle — Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth

If an ensemble of macroscopic particles is mechanically excited by vertical vibrations, the energy input is dissipated into the system by multiple inelastic collisions. As a result, when a monodisperse set of glass beads exceeds a critical number of particles a phase transition can be observed from a fluidized gas-like state to a condensed crystalline state. Systematic studies of the dependence of this critical number on the internal parameters (size and material density of the spheres) as well as the external conditions (amplitude and frequency of the shaker) are presented.