Dresden 2014 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 41: Poster - Pattern/ Nonlinear Dyn./ Fluids/ Granular/ Critical Phen.
DY 41.32: Poster
Donnerstag, 3. April 2014, 17:00–19:00, P3
How do spaghetti make contacts? — •Cyprian Lewandowski1,3, Christian Brosowski2, Max Neudecker1, Claus Heussinger2, and Matthias Schröter1 — 1Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077 Goettingen, Germany — 2Institute of Theoretical Physics, University Goettingen, 37077 Goettingen, Germany — 3Department of Physics, Imperial College London, SW7 2AZ London, United Kingdom
The aim of this study was to understand stability of random packings of cylinders based on an analysis of inter-particle contacts. Three aspect ratios (L) of cylinders were prepared from uncooked spaghettini strands. Samples were compacted with a vertical shaking apparatus and data was gathered using X-ray microtomography. Image analysis was carried out with algorithms implemented in MATLAB, achieving precision of length fit better than 0.5%. The scaling of the average global contact number with packing fraction was observed to follow the asymptotic scaling relation φ L = constant [Philipse 1996]. By carrying out a nearest-neighbour transformation, Voronoi cells for each particle were obtained. These are the first measurements that allow to elucidate the relation between local contacts and local packing fraction.