Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 3: Granular Matter
DY 3.10: Vortrag
Montag, 7. März 2016, 12:15–12:30, H46
Spontaneous heaping and secondary flows in sheared granular materials — •David Fischer1, Ralf Stannarius1, and Tamás Börzsönyi2 — 1Otto von Guericke University, Magdeburg, Germany — 2Wigner Research Center for Physics, Hungarian Academy of Sciences, Budapest, Hungary
Cylindrical containers with a rotating bottom disk (so-called split-bottom geometry) are well established devices to shear granular materials in a continuous way, and to generate well-defined localized shear bands in the granular bed. When granular material composed of anisotropic grains is sheared in such a container, a secondary flow is generated that leads to the formation of a considerable heap of material near the rotation axis. Superficially, it reminds of the Weissenberg effect in polymer solutions. This process is analyzed for different materials, and its quantitative dependence upon geometric and dynamic parameters is investigated. We find secondary flow and heaping in all investigated anisometric granular materials, both for prolate and oblate shapes. For spherical or nearly-spherical grains, this phenomenon is completely absent.