Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: POSTERS Magnetic Soft Matter

CPP 12.9: Poster

Tuesday, March 24, 2009, 14:00–16:30, P3

Effects of magnetic fields on ferrofluids in a Taylor Couette System — •Reindl Matthias — George Bähr Str. 3, 01062 Dresden

The magnetization of a ferrofluid in rest is describable by equations for the equilibrium magnetization. A flowing ferrofluid, yielding, due to shear gradients, a vorticity with directions perpendicular to a magnetic field, turns the magnetic dipoles out of magnetic field direction. The magnetization is now also dependent on the flow field. Hence, equations to describe the magnetization out of equilibrium are necessary. Since the different models for this purpose differ more or less, the adequate one has yet to be distinguished. By comparing experimental and simulation data of a model system, this goal might get achieved. As a model system, a Taylor-Couette apparatus with the fluid cell exposed to magnetic fields was chosen. Measurement data obtained by capturing the transition from circular Couette flow to Taylor vortex flow at different magnetic fields is compared to simulation data and presented.