Force-induced dispersion in heterogeneous media
Langue
en
Article de revue
Ce document a été publié dans
Physical Review Letters. 2015-07-10, vol. 115, n° 2, p. 020601 (1-5)
American Physical Society
Résumé en anglais
The effect of a constant applied external force, induced for instance by an electric or gravitational field, on the dispersion of Brownian particles in periodic media with spatially varying diffusivity, and thus mobility, ...Lire la suite >
The effect of a constant applied external force, induced for instance by an electric or gravitational field, on the dispersion of Brownian particles in periodic media with spatially varying diffusivity, and thus mobility, is studied. We show that external forces can greatly enhance dispersion in the direction of the applied force and also modify, to a lesser extent and in some cases non-monotonically, dispersion perpendicular to the applied force. Our results thus open up the intriguing possibility of modulating the dispersive properties of heterogeneous media by using externally applied force fields. These results are obtained via a Kubo formula which can be applied to any periodic advection diffusion system in any spatial dimension.< Réduire
Mots clés en anglais
Brownian motion
Classical transport
Stochastic processes
Stochastic analysis methods
Fluctuation phenomena
random processes
noise
Origine
Importé de halUnités de recherche