Regensburg 2025 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 21: Granular Matter
DY 21.1: Vortrag
Mittwoch, 19. März 2025, 09:30–09:45, H43
Coarsening dynamics of ferrogranular networks for different granular temperatures — •Ali Lakkis1, Matthias Biersack1, Oksana Bilous2, Pedro A. Sanchez2, Sofia S. Kantorovich2, and Reinhard Richter1 — 1University of Bayreuth, Experimental Physics 5, Universitätsstr. 30, 97440 Bayreuth, Germany — 2University of Vienna, Faculty of Physics, Kolingasse 14-16, 1090 Vienna, Austria
We are exploring in experiments the aggregation process in a shaken granular mixture of glass and magnetized steel beads,
filled in a horizontal vessel. After the shaking amplitude is suddenly decreased, the magnetized beads form a transient network that coarsens in time into compact clusters [1]. Recently it has been quantified how a homogeneous magnetic field B oriented in vertical direction impedes the emergence and growth of the networks [2,3], where the mean degree k of a node serves as an order parameter. Here we explore the impact of the acceleration amplitude Γ onto the velocity distribution of the particles, their granular temperature, and the coarsening dynamics of the network, i.e. k(Γ).
[1] A. Kögel, R. Maretzki, E. S. Pyanzina, P. A. Sánchez, S. S. Kantorovich, R. Richter Soft Matter, 14 (2018) 1001.
[2] M. Biersack, A. Lakkis, R. Richter, O. Bilous, P. A. Sánchez, S. S. Kantorovich Phys. Rev. E, 108 (2023) 054905.
[3] A. Lakkis, M. Biersack, O. Bilous, S. S. Kantorovich, R. Richter, J. Magn. Magn. Mater 589 (2024) 171620.
Keywords: magnetized granulate; susceptible dipolar hard spheres; network formation; growth dynamics; phase separation