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DY: Fachverband Dynamik und Statistische Physik

DY 28: Pattern formation in colloidal and granular systems II

DY 28.6: Vortrag

Freitag, 27. März 2009, 11:30–11:45, HÜL 386

The flow field of glass beads around a fixed obstacle — •Matthias Raithel¹, Christoph Krülle², and Ingo Rehberg¹ — ¹Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth, Germany — ²Maschinenbau und Mechatronik, Hochschule Karlsruhe - Technik und Wirtschaft, D-76133 Karlsruhe,Germany

In this experiment a dish filled with glass beads is shaken horizontally, so every point on that dish moves on a circular path. Controlled by the filling fraction, the oscillation frequency and amplitude, the system shows phase transitions [1] and the change from reptation to rotation [2]. By inserting an intruder the system becomes more complex. In the case of a freely moving intruder segregation occurs. The flow field around a fixed obstacle is examined in order to understand that segregation.

[1] S. Aumâitre, T. Schnautz, C. Kruelle, I. Rehberg, Phys. Rev. Lett. 90, 114302 (2003)

[2] M. Scherer, V. Buchholtz, T. Pöschel, I. Rehberg, Phys. Rev. E 54, R4560 (1996)