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DY: Fachverband Dynamik und Statistische Physik

DY 40: Posters II

DY 40.20: Poster

Donnerstag, 17. März 2011, 17:00–19:00, P3

Geometrical structure of spheres around Random Close Packing — •Frank Rietz^1,2, Charles Radin³, Harry L. Swinney³, and Matthias Schroeter² — ¹Univ. of Magdeburg — ²MPI Dynamics & Self-Organization Goettingen — ³Univ. of Texas at Austin

The name Random Close Packing refers to the experimental observation that some ways of packing of monodisperse beads (like vertical vibration or sedimentation) can’t exceed a volume fraction of ≈64%. There are several competing theories trying to explain this phenomenon and it is still unclear how to correctly define the Random Close Packing density. The three-dimensional distribution of particles below and above Random Close Packing is investigated. We match the index of the surrounding liquid to provide access to the interior of the granular bed. We measured local packing densities and order parameter by means of Voronoi cells. This allows us to comment on the question if Random Close Packing is well defined.