Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: P11: Wetting, Micro and Nano Fluidics
CPP 46.15: Poster
Mittwoch, 18. März 2015, 10:00–13:00, Poster A
Equilibration of liquid morphologies in granulates with various wettability — •Marc Schaber1, Mario Scheel3, Martin Brinkmann2, and Ralf Seemann1,2 — 1Experimental Physics, Saarland University, D-66041 Saarbrücken — 2MPI for Dynamics and Self-Organization, Am Faßberg 17, D-37073 Göttingen — 3European Synchrotron Radiation Facility, 6 rue Jules Horowitz, F-38000 Grenoble
When adding liquid to dry granulates, the liquid forms a network of capillary bridges and more complex liquid structures. Depending on wettability of the granules and geometry of the granular pile different liquid structures are formed. By means of ultrafast X-ray micro-tomography we explore the liquid equilibrium distribution emerging within granular packs. Monodisperse glass and basalt microspheres of different diameters are used as granules having small and large contact angle, respectively. By fluidizing the granulate, the packing geometry of the granules is changed and the liquid equilibrium structures are destroyed. We explore time resolved how the liquid is re-distributed and how the liquid morphologies are re-formed into a new equilibrium situation. We find a correlation between the bead diameter and the viscosity of the added liquid to the characteristic equilibration time. The absence of the equilibrium process for non-wettable beads indicates that the liquid redistribution proceeds via a thin liquid wetting film on the surface of the beads.