Berlin 2015 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 45: Focus: Disordered Systems, Glasses under Shear I (joint session CPP/ DY)

DY 45.3: Talk

Thursday, March 19, 2015, 10:15–10:30, C 243

Microrheology of a Two-Dimensional Driven Granular System — •Peidong Yu, Boris Eberhardt, Sebastian Pitikaris, and Matthias Sperl — Institut für Materialphysik im Weltraum, Deutches Zentrum für Luft- und Rahmfahrt, Köln, Deutschland

We study the motion of a tracer particle pulled inside a two-dimensional granular model system, where particle movements can be controlled and precisely tracked. We put such a system on a shaking table and apply vertical agitation as thermalization. We show how well the particles are themalized in the horizontal direction. We then drag a tracer particle through such a system with constant force or constant velocity. Effective viscosities with different parameters are measured. Different scenarios of shear thinning and shear thickening are observed. The underlying physics is discussed and compared with simulations and theories.