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DY: Fachverband Dynamik und Statistische Physik
DY 25: Franco-German Session on Granular Matter II
DY 25.3: Vortrag
Dienstag, 10. März 2026, 14:30–14:45, HÜL/S186
Angular Velocity of Spherical Particles in a Granular Gas under Microgravity during Granular Cooling — •Mahdieh Mohammadi1, Raúl Cruz Hidalgo2, Dmitry Puzyrev3, Ralf Stannarius1,3, and Kirsten Harth1,3 — 1Department of Engineering, Brandenburg University of Applied Sciences, Magdeburger Str. 50, 14770 Brandenburg an der Havel, Germany — 2Departamento de Física y Matemática Aplicada, Facultad de Ciencias , Universidad de Navarra, Pamplona, Spain — 3MARS and MTRM, Otto von Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
We investigate the rotational dynamics of spherical particles in a granular gas in microgravity, which allows a clean realization and observation of collisional kinetics. The system starts in a highly excited state and undergoes dissipative collisional cooling (loss of mean kinetic energy). Patterned spheres were tracked from video data using two cameras, their 3D trajectories and velocities were extracted. Surface markers enable 3D orientation reconstruction via feature-based and projection-consistent analysis. Continuous angular trajectories are obtained by interpolating missing orientation data. From these, we extract angular velocities and analyze their evolution across different cooling intervals.
Our studies are funded within by the German Aerospace Center (DLR) projects PARADYSE, KORDYGA and EVA-II (50WM2542, 50WM2242, 50WK2348).
Keywords: Granular Gas; Angular Velocity; Microgravity