Comptes Rendus
Thermodiffusion in ferrofluids regarding thermomagnetic convection
Comptes Rendus. Mécanique, Volume 341 (2013) no. 4-5, pp. 429-437.

Magnetic fluids, also called ferrofluids, are binary liquids consisting of magnetic nanoparticles being dispersed in a carrier liquid. They show very strong thermodiffusive behaviour with a Soret coefficient (ST) of approximately 0.16 K1 without a magnetic field. The dependence of the Soret coefficient on a magnetic field can lead to even higher values, and to a change in the coefficientʼs sign. This change in the direction of movement of the nanoparticles strongly affects the onset of thermomagnetic convection. A linear stability analysis reveals that thermodiffusion with a positive sign of the Soret coefficient enhances the onset of convection, whereas negative coefficients starting at about 0.001 K1 suppress convection at all.

Publié le :
DOI : 10.1016/j.crme.2013.02.005
Mots clés : Ferrofluids, Magnetic fluids, Rayleigh number, Soret coefficient, Thermodiffusion, Thermomagnetic convection

Lisa Sprenger 1 ; Adrian Lange 1 ; Stefan Odenbach 1

1 Technische Universität Dresden, Institute of Fluid Mechanics, Chair of Magnetofluiddynamics, 01062 Dresden, Germany
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Lisa Sprenger; Adrian Lange; Stefan Odenbach. Thermodiffusion in ferrofluids regarding thermomagnetic convection. Comptes Rendus. Mécanique, Volume 341 (2013) no. 4-5, pp. 429-437. doi : 10.1016/j.crme.2013.02.005. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2013.02.005/

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