Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 29: Poster II

DY 29.19: Poster

Donnerstag, 28. Februar 2008, 16:00–18:00, Poster C

Equation of state of wet granular matter — Axel Fingerle, Klaus Roeller, and •Stephan Herminghaus — MPI für Dynamik und Selbstorganisation, Göttingen

Wet granular matter is meanwhile established as a versatile model system for a large class of phenomena far from thermal equilibrium. We present the equation of state of wet granular matter, consisting of spherical grains wetted by a certain amount of liquid, and externally agitated to some finite granular temperature (mean kinetic energy per degree of freedom). Following earlier studies which demonstrated the enhancement of the Kolmogorov-Sinai entropy due to the capillary forces [1,2], we find expressions for the pressure of a wet granular gas as a function of granular temperature. Excellent agreement with dynamical simulations is obtained in the full relevant range of packing fractions and liquid content.

[1] A. Fingerle, S. Herminghaus, and V. Zaburdaev, Phys. Rev. Lett. 95 (2005) 198001.

[2] A. Fingerle, S. Herminghaus, and V. Zaburdaev, Phys. Rev. E 75 (2007) 061301.