Dresden 2009 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 18: Granular matter / contact dynamics
DY 18.5: Talk
Wednesday, March 25, 2009, 17:15–17:30, HÜL 386
Measurement of fluctuation-dissipation temperature in a driven dense granular suspension. — •Sonia May1, Alexander Buck2, Harry Swinney2, and Matthias Schröter1 — 1Max-Plank-Institut für Dynamik und Selbstorganisation, Göttingen, Germany — 2Center for Nonlinear Dynamics, UT Austin
We use a water-fluidised bed to drive a dense suspension of glass spheres. We can control the kinetic energy of the suspended grains by changing the flow rate and viscosity of the liquid used to fluidise them. A sphere covered with grains and connected to a torsional pendulum is immersed in the suspension, with which we measure the fluctuation-dissipation temperature of the suspension at very low driving rates. The slow driving enables us to measure energy scales even below the limit at which fluidisation becomes macroscopically visible. Here, we observe a divergence of a damping term, the granular equivalent of viscosity. This we attribute to a granular equivalent of the glass transition.