Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 38: POSTERS Micro- and Nanofluidics
CPP 38.10: Poster
Donnerstag, 26. März 2009, 17:00–19:30, P3
Static and Dynamics of Wet Granular Materials — •Somnath Karmakar1,2, Michael Sipahi1, Mario Scheel1, Marc Schaber2, Martin Brinkmann1, Marco Di Michiel3, Stephan Herminghaus1, and Ralf Seemann1,2 — 1Max Planck Institute for Dynamices and Self-Organization, Göttingen, Germany — 2Universität des Saarlandes, Saarbrücken, Germany — 3ESRF, Grenoble, France
When a small amount of liquid is added to dry granular matter, a network of capillary bridges is formed exerting an attractive force between granules and the granular pile turns into a moldable material. The resulting network of liquid morphologies changes dramatically with liquid content and wettability of the granules. We study the mechanical properties, i.e. tensile strength, yield stress and critical fluidization acceleration of wet granular materials with different wettability and grain shape like sand, glass, and basalt beads for various liquid contents. Our experimental observations show, that in case of a liquid with small contact angle, the mechanical properties of a granular pile are largely independent of the amount of added-liquid over a wide range. In case of a large contact angle, however, the mechanical properties are strongly dependent on the liquid content. We resolve this experimental finding by imaging the liquid distribution inside the granular piles, using X-ray microtomography.