Berlin 2005 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 34: Poster
DY 34.90: Poster
Montag, 7. März 2005, 15:30–18:00, Poster TU D
Axial segregation in a long horizontal rotating drum — •Tilo Finger1, Thomas John2, Andreas Voigt3 und Ralf Stannarius1 — 1Institut für Experimentelle Physik, Otto-von-Guericke Universität Magdeburg — 2Institut für Physik, Carl-von-Ossietzky Universität Oldenburg — 3Max Planck Institut für Dynamik komplexer technischer Systeme Magdeburg
The axial segregation of granular material in a long horizontal rotating drum is a well known phenomenon studied by several groups. We investigate experimentally the structures and the long time behaviour of this process. The drum is half filled with a mixture of glass beads of two different diameters and filled up with water. After starting a constant rotation the material shows a radial segregation in time scales of few seconds. In time scales of few minutes an additional axial segregation appears and a stripe pattern along the cylinder axis becomes visible. The initial width of stripes is more or less regular. When the rotation continues, the number of stripes decreases. The time scale of coarsening of the pattern is of the order of several hours up to days. We measure the coarsening at different rotation frequencies and determine the three dimensional distribution of the grains by magnetic resonance imaging.