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DY: Fachverband Dynamik und Statistische Physik
DY 62: Poster - Dynamics
DY 62.15: Poster
Thursday, March 19, 2015, 16:00–18:00, Poster A
Thermal conductivity and geometric cohesion in aspherical granular materials — •Katharina Staudt1, Felix Triska1, and Thomas Grillenbeck1,2 — 1Ignaz-Günther-Gymnasium Rosenheim — 2Fachhochschule Rosenheim
It is well known that the thermal conductivity of a granular material depends on the volume of granules per unit volume (packing fraction): The more intense the packing of thermo-conductive granules in a less conductive medium, the higher the thermal conductivity of the composite material. Most experiments and theoretical considerations use spherical granules; much less is known about the thermal conductivity of aspherical granular materials. Here, we use standard U-shaped staples as radically aspherical granules. Due to their peculiarity to show geometric cohesion (i.e., cohesion due to particle geometry), we hypothesize that their thermal conductivity at low packing fractions is higher than for comparable spherical granular materials.
In our experiments, we will systematically vary the packing fraction of the staples (in air) by different perturbations (like vibrating) or different manual stacking procedures and determine the thermal conductivity afterwards.