SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 7: Granular Matter and Contact Dynamics
DY 7.8: Vortrag
Montag, 27. März 2023, 12:00–12:15, ZEU 148
Free cooling dynamics and energy partition in 3D granular gas mixtures — •Dmitry Puzyrev1, Adrian Niemann1, Kirsten Harth2,3, Torsten Trittel1, and Ralf Stannarius1 — 1Institute of Physics and MARS, Otto von Guericke University, 39106 Magdeburg — 2Department of Engineering, TH Brandenburg, 14770 Brandenburg an der Havel — 3MARS and MRTM, OVGU, 39106 Magdeburg
Granular gases are nonlinear systems that exhibit fascinating dynamical behavior far from equilibrium, including unusual cooling properties, clustering and violation of energy equipartition. Our study focuses on 3D microgravity experiments with dilute ensembles of rod-like particles and their mixtures. In drop tower experiments at ZARM, we studied granular cooling of mixtures of rods with two different diameters. The confirmation of Haff's equation [2] describing the energy decay is of particular interest. Experimental data analysis suggests different cooling rates, and the violation of energy equipartition between the rotational and translational degrees of freedom for the mixture components. Particle detection and tracking was performed with Machine Learning-aided approach [3]. The software will be available as a Python library that can be extended to other 3D and 2D particle tracking problems.
The authors acknowledge support from DLR in projects EVA (50WM2048) and VICKI (50WM2252).
References: [1] K. Harth et al., Phys. Rev. Lett., 120 (2018), 214301 [2] P. K. Haff, J. Fluid Mech., 134 (1983), 401-430 [3] Puzyrev et al., Microgravity Sci. Technol., 32 (2020), 897