SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 7: Granular Matter and Contact Dynamics
DY 7.6: Vortrag
Montag, 27. März 2023, 11:30–11:45, ZEU 148
Non-convex particles under shear in a split bottom cell — •Mahdieh Mohammadi1, Ahmed Ashour2, Dmitry Puzyrev3, Torsten Trittel3, and Ralf Stannarius3 — 1Technische Hochschule Brandenburg — 2Future University of Egypt — 3Otto-von-Guericke-Universität Magdeburg
We study dynamical features of surface flow in the top layer of a granular bed containing non-convex tetrapod and hexapod particles in a split-bottom shear cell. Different heights of granular beds were prepared and examined. Based on Particle Image Velocimetry and Particle Tracking Velocimetry, angular and radial displacements of particles on the surface of the ensemble were derived in dependence on the number of rotations of the bottom disk. Stereoscopic measurements of surface fluctuations of the bed during shearing turn out to be a key factor in this study to characterize heap and sink formation phenomena, which are related to the secondary flow of the grain ensembles in the bulk. We acknowledge support of DPG with project STA 425/40 and DLR with project EVA (50WM2048), and stimulating discussion with K. Harth.
[1] Mahdieh Mohammadi, Dmitry Puzyrev, Torsten Trittel, and Ralf Stannarius, Phys. Rev. E 106, L052901 (2022).