Confinement effect on the dynamics of non-equilibrium concentration fluctuations far from the onset of convection

Cédric Giraudet, Henri Bataller, Yifei Sun, Aleksandar Donev, José M. Ortiz de Zárate, Fabrizio Croccolo

Research output: Contribution to journalArticlepeer-review


Abstract.: In a recent letter (C. Giraudet et al., EPL 111, 60013 (2015)) we reported preliminary data showing evidence of a slowing-down of non-equilibrium fluctuations of the concentration in thermodiffusion experiments on a binary mixture of miscible fluids. The reason for this slowing-down was attributed to the effect of confinement. Such tentative explanation is here experimentally corroborated by new measurements and theoretically substantiated by studying analytically and numerically the relevant fluctuating hydrodynamics equations. In the new experiments presented here, the magnitude of the temperature gradient is changed, confirming that the system is controlled solely by the solutal Rayleigh number, and that the slowing-down is dominated by a combined effect of the driving force of buoyancy, the dissipating force of diffusion and the confinement provided by the vertical extension of the sample cell. Moreover, a compact phenomenological interpolating formula is proposed for easy analysis of experimental results. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish (US)
Article number120
JournalEuropean Physical Journal E
Issue number12
StatePublished - Dec 1 2016


  • Flowing Matter: Liquids and Complex Fluids

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • General Chemistry
  • General Materials Science
  • Surfaces and Interfaces


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