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Thermomagnetic convection in magnetic fluids influenced by a time‐modulated magnetic field
Author(s) -
Engler Harald,
Odenbach Stefan
Publication year - 2008
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200810951
Subject(s) - thermomagnetic convection , magnetic field , magnetic pressure , convection , mechanics , condensed matter physics , magnetic energy , ferrofluid , magnetostatics , physics , materials science , magnetization , quantum mechanics
Material– and flow properties of magnetic fluids can be influenced by applying an external magnetic field. In this work we will particularly consider the onset of convection in magnetic fluids which is influenced by a magnetic force. In a horizontal magnetic fluid layer the force arises if a temperature gradient and an external magnetic field is applied. The behaviour of the onset of convection is investigated for a static and a time–modulated magnetic field. For the case of a static magnetic field the onset of convection depends on the strength of the field and for a time–modulated magnetic field an additional dependence on the frequency of magnetic field variation is found. The experimental results presented here confirm in principle the theoretical predictions about the influence of static and time–modulated magnetic forces on the onset of convection. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)