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DY: Fachverband Dynamik und Statistische Physik
DY 48: Granular Matter and Contact Dynamics
DY 48.6: Talk
Thursday, March 21, 2024, 16:15–16:30, BH-N 128
Clustering of Magnetized Iron Granulate – Less is More Susceptible — •Ali Lakkis1, Matthias Biersack1, Oksana Bilous2, Sofia Kantorovich2, and Reinhard Richter1 — 1University of Bayreuth, Experimental Physics 5, Universitätsstrasse 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]. Here we investigate how an increased volume fraction φ of the granulate accelerates the coarsening. Moreover, we explore the coarsening dynamics in the (φ,B)-control parameter space, and observe that low filling fractions are more susceptible to an increase of B than high ones [3].
[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, submitted (2023).
Keywords: magnetized granulate; susceptible dipolar hard spheres; network formation; growth dynamics; phase separation