Thermomagnetic convection influenced by the magnetoviscous effect

The mechanism of thermomagnetic convection in ferrofluids which is introduced by a magnetic field is well understood. To describe this kind of convection, it is assumed that the material properties, e. g. the viscosity η are independent from the magnetic field. However under certain circumstances ferrofluids show a magnetoviscous effect that means the increase of η in the presence of a magnetic field. Both effects have been well investigated but independently from each other. In this paper it is experimentally shown how the magnetoviscous effect and therefore the increase of η influence the behaviour of the thermomagnetic convection.