Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: Poster: Wetting, Micro and Nano Fluidics
CPP 34.23: Poster
Wednesday, March 13, 2013, 16:30–18:30, Poster C
Oscillations and Avalanches in Two-Dimensional Flowing Crystals — •Jean-Baptiste Fleury1, Ohle Caussen2, Stephan Herminghaus2, Martin Brinkmann2, and Ralf Seemann1,2 — 1Experimental Physics, University of Saarland, Saarbrücken, Germany — 2Max-Planck Institute for Dynamics and Self-Organization, Göttingen, Germany
We study the mechanical response and the stability of monodisperse droplet packings in quasi 2d micro-channels under longitudinal compression. Depending on the exact choice of parameter a static droplet arrangement can be mechanically unstable and segregate into domains of higher and lower packing fraction. When these droplet arrangements with negative compressibility slowly flow along a microfluidic channel periodic density oscillations between the stable droplet packings can be found. For increasing flow velocity the sections of larger and lower packing fraction increase, finally leading to complex non-equilibrium droplet re-arrangements similar to avalanches. We will experimentally and theoretically discuss the mechanisms of the dynamical droplet re-arrangements in an out-of-equilibrium microfluidic system.