Regensburg 2022 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 11: Granular Matter and Contact Dynamics

DY 11.3: Vortrag

Montag, 5. September 2022, 16:00–16:15, H19

Granular Gases of Mixtures of Rods in Microgravity — •Kirsten Harth1,2, Dmitry Puzyrev3, Torsten Trittel3, and Ralf Stannarius31Fachbereich Technik, TH Brandenburg, Brandenburg an der Havel, Deutschland — 2MARS und MRTM, Otto von Guericke Universität Magdeburg, Deutschland — 3Institut für Physik und MARS, Otto von Guericke Universität Magdeburg, Deutschland

Granular gases consist of macroscopic particles in erratic motion, rarely colliding among each other. They are a comparatively simple, yet illustrative example of a non-equilibrium dynamical system. Numerous theoretical and numerical studies deal with their dynamics, however, the realization of 3D experiments is rare. It usually requires microgravity. Typical experiments are either performed under continuous external energy supply or they consider the process of collective kinetic energy decay by dissipation (granular cooling). It has been recently shown that both ensembles of rods and spheres follow the scaling predicted by Haff in 1983, however, with stark quantitative disagreement with the theory.

Here, we consider a bidisperse ensemble of 2 types of rods in a cuboid container. We track their positions and rotations in 3D. Expererimental data will be compared to validated numerical simulations of frictional rods under similar conditions. We extract kinectic energies in individual degrees of freedom and other statistical quantities.

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