Regensburg 2013 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 21: Granular Matter / Contact Dynamics
DY 21.9: Vortrag
Mittwoch, 13. März 2013, 17:15–17:30, H47
Equilibration of liquid morphologies in granulates with different wettability — •Marc Schaber1, Mario Scheel3, Martin Brinkmann1,2, Marco Di Michiel3, and Ralf Seemann1,2 — 1Experimental Physics, Saarland University, D-66041 Saarbrücken — 2MPI for Dynamics and Self-Organization, D-37073 Göttingen — 3European Synchrotron Radiation Facility, 6 rue Jules Horowitz, F-38000 Grenoble
When adding liquid to dry granulates, the liquid forms individual capillary bridges or a network of liquid morophologies depending on the amount of liquid and the wettability of the granules. Fairly 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 temporarily changed and accordingly the liquid distribution is destroyed. Using ultra-fast X-ray tomography we explore the time resolved re-distribution of liquid after stopping the fluidization and the re-formation of a new equilibrium distribution of the liquid. For non-wettable basalt beads no liquid redistribution was found. For wettable glass beads, however, a characteristic liquid equilibrium distribution is achieved after a time scale which depends on bead diameter, the viscosity and the amount of the added liquid.