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Berlin 2012 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 21: Granular Matter/Contact Dynamics

DY 21.4: Talk

Wednesday, March 28, 2012, 15:15–15:30, MA 144

Granular Gases of Anisometric Particles: A Microgravity Experiment — •Kirsten Harth1, Torsten Trittel1, Ulrike Kornek1, Stephan Höme2, Ulrike Strachauer1, Karl Will3, and Ralf Stannarius11Institut für Experimentelle Physik, Otto-von-Guericke Universität Magdeburg — 2Institut für Automatisierungstechnik, Otto-von-Guericke Universität Magdeburg — 3Institut für Elektronik, Otto-von-Guericke Universität Magdeburg

Although granular materials are widespread in nature and technological processes, a comprehensive dynamic theory is lacking. Depending on the type and strength of excitation, granulates display different aggregate states similar to thermodynamic states of matter. Granular gases represent dilute ensembles of grains interacting through inelastic collisions. At present, there is a vast amount of analytical or numerical predictions of physical properties of such gases, but only few experiments.

We investigate a granular gas of rodlike particles in microgravity on a sounding rocket. Videos are recorded from two stereoscopic perspectives during flight. Individual rods are tracked in consecutive frames. We analyse classical statistical quantities such as the distribution of energy on different degrees of freedom, orientation, velocity and density distributions. Two different excitation strengths and the cooling of the granular gas after change of the excitation parameters are investigated.

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