Dresden 2006 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.109: Poster

Donnerstag, 30. März 2006, 16:00–18:00, P1

Liquid Bridges in Wet Granular Systems: Networks and Clusters — •Mario Scheel, Stephan Herminghaus, and Ralf Seemann — MPI for Dynamics and Self-Organization, Bunsenstr. 10, D-37073 Göttingen, Germany

The properties of a dry granulate change dramatically when small amounts of liquid are added. This is due to capillary bridges forming between mutually adjacent grains in the pile, which exert an attractive force by virtue of the surface tension of the liquid. As more liquid is added, the liquid forms clusters, and the stability of the pile is reduced. Although the tensile strength of wet granulates can be roughly estimated from the capillary forces, a quantitative theory of the mechanical properties of granulate requires a detailed understanding of the topology of the complex network of capillary bridges and clusters. We have determined the macroscopic properties of model granulates with vertical agitation experiments, and the microscopic geometry of the distribution of liquid via x-ray microtomography. Transitions from capillary bridges to clusters as well as percolation can be clearly identified.