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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.108: Poster

Thursday, March 30, 2006, 16:00–18:00, P1

Unclustering transition in wet granular matter — •Axel Fingerle and Stephan Herminghaus — MPI for Dynamics and Self-Organization, Bunsenstr. 10, 37073 Göttingen, Germnay

In earlier studies of free cooling of dry granular matter in one dimension, the aggregation of mass in clusters was found to be a monotonic process in time. We demonstrate analytically and by extensive simulations that the clustering of dense wet granular matter is not monotone but undergoes a sharp unclustering transition. We put forward a mean field theory for wet granular matter far from thermal equilibrium using the Minimal Capillary Model [S. Herminghaus, Adv. Phys., 54, 221 (2005)] and point out that wet granular matter belongs to the class of dissipative piecewise Hamiltonian systems, which is discussed in the context of recent fluctuation theorems.