Thermodiffusion in ferrofluids regarding thermomagnetic convection

Lisa Sprenger; Adrian Lange; Stefan Odenbach

doi:10.1016/j.crme.2013.02.005

Thermodiffusion in ferrofluids regarding 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

Comptes Rendus. Mécanique, Volume 341 (2013) no. 4-5, pp. 429-437.

Résumé

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 ( $S_{T}$ ) of approximately $0.16 K^{- 1}$ 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 $- 0.001 K^{- 1}$ suppress convection at all.

Publié le : 2013-03-15

DOI : 10.1016/j.crme.2013.02.005

Mots clés : Ferrofluids, Magnetic fluids, Rayleigh number, Soret coefficient, Thermodiffusion, Thermomagnetic convection

Affiliations des auteurs :

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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     title = {Thermodiffusion in ferrofluids regarding thermomagnetic convection},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {429--437},
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     year = {2013},
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     language = {en},
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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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