Convective instability of magnetized ferrofluids

Mark I. Shliomis, Boris L. Smorodin

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52 Scopus citations

Abstract

Convective instability in a flat ferrofluid layer subject to a transverse uniform magnetic field is investigated theoretically. A temperature gradient imposed across the layer induces a concentration gradient of magnetic grains owing to the Soret effect. Both these gradients cause a spatial variation in magnetization that establishes a gradient of magnetic field intensity within the fluid layer. The field gradient induces in its turn a redistribution of magnetic grains due to magnetophoresis. The resulting self-consistent magnetic force tries to mix the fluid. Linear analysis performed for the case of realistic boundary conditions on confined horizontal planes predicts double-diffusive oscillatory instability in a certain region of parameters, whereas if the particle diffusion had been not operative, then only stationary instability would occur.

Original languageEnglish
Pages (from-to)197-202
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume252
Issue number1-3 SPEC. ISS.
DOIs
StatePublished - 1 Nov 2002

Keywords

  • Convective instability
  • Ferrofluids
  • Magnetophoresis
  • Soret effect

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