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Thermal convection in binary fluid mixtures with a weak concentration diffusivity, but strong solutal buoyancy forces

MPG-Autoren
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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Zitation

Ryskin, A., Müller, H. W., & Pleiner, H. (2003). Thermal convection in binary fluid mixtures with a weak concentration diffusivity, but strong solutal buoyancy forces. Physical Review E, 67(4): 046302.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-62F3-3
Zusammenfassung
Thermal convection in binary liquid mixtures is investigated in the limit where the solutal diffusivity is weak, but the separation ratio is large. Representative examples are colloidal suspensions such as ferrofluids. With a grain size being large on molecular length scales, the particle mobility is extremely small, allowing to disregard the concentration dynamics in most cases. However, this simplification does not hold for thermal convection: Due to the pronounced Soret effect of these materials in combination with a considerable solutal expansion, the resulting solutal buoyancy forces are dominant. Indeed, convective motion is found to set in at Rayleigh numbers well below the critical threshold for single-component liquids. A nonlinear analysis demonstrates that the amplitude quickly saturates in a state of stationary convective motion.