Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTERS Driven Soft Matter

CPP 20.8: Poster

Mittwoch, 27. Februar 2008, 16:00–18:30, Poster A

Instabilities in straight and curved microchannels — •Virginie Vergnat and Christian Wagner — Technische Physik, Universität des Saarlandes, D-66123 Saarbrücken

We present experimental measurements on flow instabilities of pressure driven polymer solutions in curved microchannels. We investigate how these instabilities develop at the end of the curvature, when the microchannel becomes a straight, flat channel. The pressure driven flow of elastic liquids in curved channels is linear unstable whilst in straight channels it is stable. But the form of, and the threshold to, a nonlinar instability is controversially discussed. We use Micro-PIV to determine the type of instability, e.g if there might be convective or global instability regimes.