Regensburg 2004 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 44: Granular Systems
DY 44.3: Vortrag
Donnerstag, 11. März 2004, 15:15–15:30, H2
Granular surface waves upon circular shaking — •Andreas Götzendorfer1, Almudena Garcia1, Christof Krülle1, Ingo Rehberg1, Rafal Grochowski2, Peter Walzel2, Hamid Elhor3, and Stefan J. Linz3 — 1Experimentalphysik V, Universität Bayreuth — 2Mechanische Verfahrenstechnik, Universität Dortmund — 3Theoretische Physik, Universität Münster
We study the behaviour of dry granular material on vibratory conveyors. These machines are ubiquitous in industry and utilized for transport of small components, coal pieces, cereal grains, fertilizer granulates, sands, powders ... It is already known that for vertical sinusoidal vibrations above a critical shaking intensity the granular material shows surface waves. In our experiment we superpose the vertical vibration with a horizontal vibration of the same amplitude and a phase shift of π/2. That means that the support follows a circular trajectory. For this kind of shaking non-stationary waves are observed in a certain driving range. These pattern formation phenomena have a direct impact on the transport properties of the conveyor and are therefore of importance for industrial applications.