Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: POSTERS Micro- and Nanofluidics
CPP 22.8: Poster
Mittwoch, 27. Februar 2008, 16:00–18:30, Poster A
Recirculation flows and friction in confined gel emulsions — •Audrey Steinberger1, Shashi Thutupalli1, Ralf Seemann1,2, and Stephan Herminghaus1 — 1MPI for Dynamics and Self-organization, D-37073 Göttingen — 2Experimental Physics, Saarland University, D-66041 Saarbrücken
Emulsions with a high dispersed phase volume fraction, the so-called gel-emulsions, are not only a promising tool for handling liquids in microfluidic processes but also a convenient model system to study friction between membranes, as the arrangement of monodisperse droplets is defined and can be manipulated by the geometry of the microchannel in which they are flowing. Recirculation flows -controlling the mixing- inside the droplets are induced by the friction at the interfaces. We study experimentally those recirculation flows, using micro- particle image velocimetry (µ-PIV), as a function of the arrangement of the droplets and the dispersed phase volume fraction, in order to investigate the friction properties of emulsions in the limit where the thickness of the continuous phase lamellas becomes very small, and possibly reduces to a surfactant bilayer.