Diffusive mass transfer by non equilibrium fluctuations: Fick's law revisited

Details Diffusive mass transfer by non equilibrium fluctuations: Fick's law revisited Diffusive mass transfer by non equilibrium fluctuations: Fick's law revisited

2000-06-09

arxiv.org/abs/cond-mat/0006163v1

Phys. Rev.E 63,012105/1-4 (2001)

Physics

Condensed Matter

Statistical Mechanics

6 pages, submitted to PRL

Scientific paper

10.1103/PhysRevE.63.012105

Recent experimental and theoretical works have shown that giant fluctuations are present during diffusion in liquid systems. We use linearized fluctuating hydrodynamics to calculate the net mass transfer due to these non equilibrium fluctuations. Surprisingly the mass flow turns out to coincide with the usual Fick's one. The renormalization of the hydrodynamic equations allows us to quantify the gravitational modifications of the diffusion coefficient induced by the gravitational stabilization of long wavelength fluctuations.

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