Berlin 2012 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 3: Fluid dynamics I
DY 3.2: Talk
Monday, March 26, 2012, 10:15–10:30, MA 144
Non-linear rheology of active soft matter — •Sebastian Heidenreich1 and Sabine H. L. Klapp2 — 1Physikalisch Technische Bundesanstalt Berlin, Germany — 2Technische Universität Berlin, Germany
From self-sustained bacterial turbulence to viscosity reduction, active soft matter show amazing non-equilibrium effects and unusual flow behavior. The flow of complex fluids is characterized by its rheological properties as, for example, shear viscosity and normal stress differences. In the presentation, we discuss the response of active particle suspensions or active gels subjected to a shear flow. Using a set of extended hydrodynamic equations we derive a variety of analytical expressions for shear viscosity and normal stress differences. Depending on the nature of activity, the system show shear-thickening and -thinning in qualitative agreement with experiments. Furthermore, predicted changes of normal stress differences are surprising and different compared with passive counterparts.