New problems of particle transfer in ferrocolloids: Magnetic Soret effect and thermoosmosis
Institute of Physics, University of Latvia, Salaspils-1, LV-2169, Latvia
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Accepted: 21 October 2004
Published online: 16 November 2004
The paper deals with critical reviewing of the experiments on thermodiffusion in ferrocolloids. The observed magnetic Soret effect is much stronger than that predicted theoretically. It is shown that the main reason of that is the influence of the magnetic field on mass diffusion. Besides, some measurements are affected by uncontrolled thermal and solutal magnetic convection. In porous media, when macroscopic convection is suppressed, thermodiffusion is accompanied by thermoosmosis as well as by a microconvective mass transfer induced by particle magnetophoresis on filter grains.
PACS: 75.50.Mm Magnetic liquids – / 82.70.Dd Colloids – / 66.10.Cb Diffusion and thermal diffusion –
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2004