SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 7: Granular Matter and Contact Dynamics
DY 7.7: Vortrag
Montag, 27. März 2023, 11:45–12:00, ZEU 148
Forces on obstacles suspended in flowing granular matter — •Jing Wang1, Bo Fan2, Tivadar Pongó3, Tamás Börzsönyi2, Raúl Cruz Hidalgo3, and Ralf Stannarius1 — 1Institute of Physics, Otto von Guericke University Magdeburg, Magdeburg, Germany — 2Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Budapest, Hungary — 3Física y Matemática Aplicada, Facultad de Ciencias, Universidad de Navarra, Pamplona, Spain
We investigate the force on a spherical obstacle exerted by a flowing granular material. A sphere suspended in a discharging silo experiences mechanical forces both from the weight of the overlaying layers and from friction of the surrounding moving granular material. When the flow stops due to clogging of the silo, in experiments with hard frictional glass beads, the force on the obstacle remains exactly the same as during flow. In contrast, for nearly frictionless soft hydrogel particles the force decreased considerably after the flow stopped. The dependence of the total force on the obstacle diameter is qualitatively different for the two types of material: It grows quadratically with the sphere diameter of the obstacle for hydrogel spheres, while it grows much weaker, nearly linearly with the obstacle diameter, in a bed of hard frictional glass spheres.