Berlin 2012 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
DY: Fachverband Dynamik und Statistische Physik
DY 29: Posters II
DY 29.48: Poster
Thursday, March 29, 2012, 17:00–19:00, Poster A
Fluctuation Dissipation Temperature in a Driven Granular Suspension — •Chih-Wei Peng and Matthias Schröter — Max-Planck-Institute for Dynamics and Self-Organization, Göttingen, Germany
The concepts of statistical mechanics have been widely applied to explain the phenomena observed in granular systems. Granular temperature in particular, is one of the most important quantities in the statistical approach to granular systems. Granular temperature can be defined on dynamical systems, namely, average kinetic energy temperature(Tkin) or fluctuation dissipation theorem based temperature(TFD)[1]. In our experiment, a torsion pendulum is set up, and one end of the pendulum is immersed into a granular suspension which is driven by water fluidization. By measuring the random torque due to the collision of particles and the dissipation of an external driven torque on the pendulum, we can obtain the energy scale which is related to fluctuation-dissipation temperature (TFD). In addition, this setup can also be used to measure TFD around the fluidization threshold, which can be related to glassy behavior.
[1] G. D’Anna, P. Mayor, A. Barrat, V. Loreto, and Franco Nori: Nature 424, 909 (2003)