Abstract
Although the Soret effect induces only small chemical separations, its influence on the variations of physical parameters may be larger than the influence of the thermal gradient from which it results. The effect has been recognized and extensively studied in the Rayleigh–Bénard problem for instabilities generated by density fluctuations [1–4] . In the same way that for the mixture density, the Soret effect may influence significantly the surface tension variations in the presence of a temperature gradient. The interaction between thermocapillary and concentration-capillary mechanisms for promoting motion in binary mixture fluids has motivated many authors to study the Marangoni–Bénard instability in the presence of the Soret effect and important similarities with the Rayleigh–Bénard convection have been evidenced [5] .
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