Thermal diffusion in a binary liquid due to rectified molecular fluctuations | Zendy

Simon Villain-Guillot | Zendy; Aloïs Würger | Zendy

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Thermal diffusion in a binary liquid due to rectified molecular fluctuations

Author(s) -

Simon Villain-Guillot,

Aloïs Würger

Publication year - 2011

Publication title -

physical review e

Language(s) - English

Resource type - Journals

eISSN - 1550-2376

pISSN - 1539-3755

DOI - 10.1103/physreve.83.030501

Subject(s) - binary number , diffusion , molecular dynamics , thermal diffusivity , inertia , moment of inertia , thermal , thermal fluctuations , center of mass (relativistic) , materials science , lennard jones potential , thermophoresis , temperature gradient , mechanics , thermodynamics , physics , statistical physics , classical mechanics , energy–momentum relation , quantum mechanics , nanofluid , arithmetic , mathematics

International audienceThe Soret motion in binary liquids is shown to arise to a large extent from rectified velocity fluctuations. From a hard-bead model with elastic collisions in a nonuniform temperature, we derive a net force on each molecule, which is proportional to the temperature gradient and depends on the ratio of the molecular masses and moments of inertia. Our findings agree with previous numerical simulations and provide an explanation for the thermal diffusion isotope effect observed for several liquids

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