Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 40: Granular Matter
DY 40.4: Vortrag
Mittwoch, 22. März 2017, 17:15–17:30, ZEU 118
Energy dissipation in sheared wet granular piles — •Anna-Lena Schuhmacher1, Marc Schaber1, Somnath Karmakar1, Mario Scheel3, Marco DiMichiel3, Martin Brinkman1,2, and Ralf Seemann1,2 — 1Experimental Physics, Saarland University, 66041 Saarbruecken, Germany — 2MPI for Dynamics and Self-Organization, 37077 Goettingen, Germany — 3European Synchrotron Radiation Facility, 38000 Grenoble, France
The resistance of granular bead packs is explored when being sheared with a parabolic profile at constant shear volume. The dissipated energy can be determined from the measured differential pressure and increases about linearly with confining pressure for both dry and wet bead packs. However, the dissipated energy for wet beads has a finite value for vanishing external pressure and increases slower with external pressure compared to dry beads.
Using a downsized version of the shear cell the reorganization of beads and liquid is imaged using ultrafast x-ray micro-tomography. The movement of each bead can be tracked during the shear process. The relative movement of the beads causes the breakup of liquid capillary bridges. The contribution of the breaking capillary bridges to the dissipated energy can be quantified by directly detecting individual rupture events.