Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Focus: Magnetic Soft Matter II

CPP 20.9: Talk

Wednesday, March 25, 2009, 12:15–12:30, ZEU 222

Thermomagnetic convection in magnetic fluids influenced by spatially modulated magnetic fields — •Adrian Lange and Stefan Odenbach — Technische Universität Dresden, Institute of Fluid Mechanics, Chair of Magnetofluiddynamics, 01062 Dresden, Germany

The influence of a spatially modulated magnetic field on the convection in a horizontal layer of magnetic fluid bounded by isothermal non-magnetic boundaries is analysed. Such a magnetic field is generated by a spatial modulation of the top and bottom boundary of the fluid layer. Depending on the sign of the relative phases between the modulations, the basic state, the behaviour of the critical Rayleigh number, and the character of the onset of convection is studied. With respect to the latter, it is of particular interest if a Hopf bifurcation can be found as for spatially periodic modulated Rayleigh-Bénard convection [1].

[1] R. Schmitz and W. Zimmermann, Phys. Rev. E 53, 5993 (1996).