Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
DY: Fachverband Dynamik und Statistische Physik
DY 30: Posters II
DY 30.48: Poster
Donnerstag, 25. März 2010, 16:00–18:00, Poster C
Coarsening in granular segregation, an entropic approach — •Tilo Finger1, Matthias Schröter2, and Ralf Stannarius1 — 1Otto-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)