Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 40: Granular Matter
DY 40.3: Vortrag
Mittwoch, 22. März 2017, 17:00–17:15, ZEU 118
Energy Partition During Cooling of Granular Gases of Rodlike Grains in Microgravity — •Kirsten Harth1,2, Torsten Trittel1, Sandra Wegner1, and Ralf Stannarius1 — 1Otto von Guericke Univesität Magdeburg, Institut für Experimentelle Physik — 2Univesiteit Twente, Physics of Fluids
Granular gases are loose emsembles of grains interacting by dissipative collisions. They represent one of the simplest and most fundamental granular many-particle systems and thus the topic of manifold theoretical investigations. The collective loss of energy of granular gases from an initially excited state is termed granular cooling, and is probably the most frequently theoretically investigated aspect of granular gases. Experimental realizations minimizing disturbances from the container boundaries and minimal spatial inhomogeneities oft he initial state require microgravity. For 3D granular gases, the use of rodlike grains instead of spheres proves advantageous as rotational as well als translational motions are accessible and the spatial distributions are more uniform than those of spherical grains. Here, we address the granular cooling of gases of rodlike grains in micro-gravity. We focus on the evolution oft he decay and the partition of kinetic energy on the different degrees of freedom. Drop tower experiments offer fundamental insights into the energy equilibration and homogeneous cooling of a 3D granular gas.