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Journal Article

Thermodiffusion effects in convection of ferrofluids

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons48678

Ryskin,  A.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48463

Müller,  H. W.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48589

Pleiner,  Harald
MPI for Polymer Research, Max Planck Society;

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Citation

Ryskin, A., Müller, H. W., & Pleiner, H. (2003). Thermodiffusion effects in convection of ferrofluids. Magnetohydrodynamics, 39(1), 51-56.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-62D9-1
Abstract
Thermal convection in ferrofluids, the colloidal suspension of ferromagnetic particles, is investigated theoretically. Ferrofluids are treated as binary liquid mixtures with weak solutal diffusivity but large separation ratio. Due to the pronounced Soret effect of these materials in combination with a considerable solutal expansion, the resulting solutal buoyancy forces are dominant and the concentration dynamics cannot be disregarded for thermal convection. In principle, convective motion sets in at Rayleigh numbers well below the critical threshold for single-component liquids. But only far above this (hypothetical) threshold the growth dynamics of the amplitude is fast enough to be detectable and a nonlinear analysis demonstrates that there it quickly saturates in a state of stationary convective motion.