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Convection in Binary Liquids with Soret Effect: What We Can Learn from Laser Doppler Velocimetry Experiments

  • J. K. Platten
  • O. Lhost
Chapter
  • 147 Downloads
Part of the NATO ASI Series book series (NSSB, volume 225)

Abstract

It has been recognized since a long time that Rayleigh-Bénard convection in binary mixtures possesses a rich variety of dynamical behaviors due to the coupling between the temperature and the concentration fields (since a more recent review does not exist, see e.g. Platten & Legros 1984). For example, the oscillatory onset of convection was not only theoretically predicted almost 20 years ago (Platten 1971 — Shteinberg 1971 — Hurle & Jakeman 1971 — Legros et al. 1972) but also experimentally observed by inserting temperature probes (thermocouple, thermistance, ...) inside the liquid layer (Platten & Chavepeyer 1973). In this last paper, far away from the critical point, very regular and sustained temperature oscillations were recorded in a circular container of large aspect ratio (diameter/height ≃ 13 cm/0.32 cm) were a regular roll pattern is even not expected. Also, an hysteretic effect in Schmidt—Milverton plots was discovered (Platten & Chavepeyer 1973). However the exact nature of the “oscillator” was not resolved.

Keywords

Rayleigh Number Large Aspect Ratio Critical Rayleigh Number Traveling Wave Double Diffusive Convection 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1990

Authors and Affiliations

  • J. K. Platten
    • 1
  • O. Lhost
    • 1
  1. 1.State university of MonsMonsBelgium

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