Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: Poster: Wetting, Micro and nanofluidics
CPP 21.18: Poster
Mittwoch, 28. März 2012, 11:00–13:00, Poster A
Importance of Mechanical Properties 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 microchannels under longitudinal compression. Depending on the exact choice of parameter a considered static droplet arrangement can be mechanically unstable and segregates into domains of higher and lower packing fraction. This is of fundamental importance also for corresponding flowing systems as it is not possible to generate mechanically stable droplet trains in this fairly large region of accessible volume fraction (around 15%) [1]. As a consequence flowing droplet arrangements present complex non-equilibrium droplet rearrangements, in these parameter regions, arising from the coupling of interfacial instabilities and dissipative friction. We will experimentally and theoretically discuss these mechanisms of dynamical rearrangements in an out-of-equilibrium microfluidic system.
[1] J-B. Fleury, O. Caussen, S. Herminghaus, M. Brinkmann and R. Seemann, Appl. Phys. Lett. (to be published, 2011)