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Regensburg 2010 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Posters II

DY 30.48: Poster

Thursday, March 25, 2010, 16:00–18:00, Poster C

Coarsening in granular segregation, an entropic approach — •Tilo Finger1, Matthias Schröter2, and Ralf Stannarius11Otto-von-Guericke-University-Magdeburg — 2MPI for Dynamics and Self-organization Göttingen

Binary mixtures of different sizes or densities tend to segregate under several conditions of agitation. Segregation by size in a partially filled horizontal rotating drum has become a classical experiment in granular physics. Three types of segregation may occur in a rotating drum. An immediate radial segregation of the large and small particles (within few revolutions) is often followed by an axial segregation into a stripe pattern, on a slower time scale (several hundred revolutions). Subsequently, a coarsening process leads to the dissolution and merging of individual stripes, towards a complete axial demixing of the two particle species [1]. Here we present an X-ray tomography study which indicates that the driving mechanism of this coarsening process might be the increase of configurational entropy [2].

[1] T. Finger et al., PRE 74, 031312 (2006)

[2] S.F. Edwards & R.B.S. Oakeshott, Physica A 157, 1080 (1989)

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