Dresden 2014 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 18: Granular Matter / Contact Dynamics
DY 18.3: Talk
Wednesday, April 2, 2014, 10:00–10:15, ZEU 118
Equilibration of liquid morphologies in granulates with different wettability — •Marc Schaber1, Mario Scheel3, Martin Brinkmann1,2, Marco DiMichiel3, and Ralf Seemann1,2 — 1Experimental Physics, Saarland University, D-66041 Saarbrücken — 2MPI for Dynamics and Self-Organization, D-37073 Göttingen — 3European Synchrotron Radiation Facility, F-38000 Grenoble
When adding liquid to dry granulates of spherical beads, 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 equilibrium distribution is destroyed. Using ultra-fast X-ray tomography we explore the time resolved re-distribution and re-organisation of liquid after stopping the fluidization and the evolution of all the bridges in the granulate. For poorly-wettable basalt beads no liquid redistribution was found. For wettable glass beads, however, a characteristic liquid equilibrium distribution is achieved after a characteristic time scale which depends on bead diameter, the viscosity and the amount of the added liquid.