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DY: Fachverband Dynamik und Statistische Physik

DY 40: Posters II

DY 40.30: Poster

Thursday, March 17, 2011, 17:00–19:00, P3

Capillary interaction between spherical particles: multi-body interactions and the effect of contact angle hysteresis — Ciro Semprebon, Stephan Herminghaus, and •Martin Brinkmann — Max Planck Institute for Dynamics and Self-Organization, Bunsenstr. 10, 37073 Göttingen, Germany

The mechanics of mixtures of sub-millimetric grains and liquids play an important role in process engineering and in the industrial scale production of many materials. At low liquid saturations, the cohesion in a granular assembly of spherical gains can be well explained by capillary forces induced by individual liquid bridges between neighboring beads. To account for the presence of larger liquid clusters, we numerically computed the capillary forces between three and more beads in contact to certain types of liquid clusters along with their interfacial energy and Laplace pressure. Besides these `multi-body' interactions, we considered effects of contact angle hysteresis on the capillary interaction between two spherical particles. Both effects have an impact on the collective mechanical behavior of large particle assemblies and can be easily implemented in three dimensional contact dynamic simulations of frictional particles.