Regensburg 2007 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Poster II

DY 30.56: Poster

Thursday, March 29, 2007, 16:00–18:00, Poster D

Horizontal Brazil-nut effect in a binary mixture — •Christian Kröner, Christof Krülle, and Ingo Rehberg — Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth, Germany

The segregation of one big sphere in a monolayer of spheres rolling on a circularly vibrating table in a circular container is observed. The granular system consists of a binary mixture with size ratio 3 to 2. Depending on the ratio of the particles’ material density and size, migration of the large intruder particle occurs either towards center or to the boundary. This is called the horizontal (reverse) Brazil-nut effect (H(R)BNE)[1]. The crossing point between HBNE and HRBNE is determined by varying the intruder’s size and maintaining its material density. By varying the proportion of small particles in the binary mixture it was observed that the average particle size is a crucial parameter. For a better understanding of the mechanisms the interaction between the intruder and the binary mixture are studied in detail.

[1] T. Schnautz, R. Brito, C. A. Kruelle, and I. Rehberg, Phys. Rev. Lett. 95, 028001 (2005)