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DY: Fachverband Dynamik und Statistische Physik

DY 24: Granular matter II

DY 24.3: Vortrag

Donnerstag, 28. Februar 2008, 10:30–10:45, MA 004

Model for pattern formation of granular matter on vibratory conveyors — •Michael Grevenstette and Stefan Jakob Linz — Institut für Theoretische Physik, WWU Münster, Wilhelm-Klemm-Straße 9, D-48149 Münster, Germany

Recently, Götzendorfer et al. [Powders and Grains ’05, 1181 (2005)] have observed subharmonic propagating surface wave patterns if granular material on a trough is subject to a combination of vertical and horizontal periodic driving. The observed structures are non-stationary in space, drift with a constant mean velocity along the trough and oscillate subharmonically with half the driving frequency. We present a phenomenological model [1] for the surface evolution of the granular material that qualitatively reproduces and explains important aspects of the experimentally observed patterns.

[1] Grevenstette M, Linz SJ, Model for pattern formation on a vibratory conveyor, Chaos, Solitons & Fractals (2007), doi:10.1016/j.chaos.2007.06.101