Giant enhancement of hydrodynamically enforced entropic trapping in thin channels

Autor:	Martens, S., Straube, A. V., Schmid, G., Schimansky-Geier, L., Hänggi, P.
Rok vydání:	2014
Předmět:	Condensed Matter - Statistical Mechanics Condensed Matter - Soft Condensed Matter
Druh dokumentu:	Working Paper
DOI:	10.1140/epjst/e2014-02321-9
Popis:	Using our generalized Fick-Jacobs approach [Martens et al., PRL 110, 010601 (2013); Martens et al., Eur. Phys. J. Spec. Topics 222, 2453-2463 (2013)] and extensive Brownian dynamics simulations, we study particle transport through three-dimensional periodic channels of different height. Directed motion is caused by the interplay of constant bias acting along the channel axis and a pressure-driven flow. The tremendous change of the flow profile shape in channel direction with the channel height is reflected in a crucial dependence of the mean particle velocity and the effective diffusion coefficient on the channel height. In particular, we observe a giant suppression of the effective diffusivity in thin channels; four orders of magnitude compared to the bulk value. Comment: 16 pages, 8 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1407.5673 Zobrazit plný text záznamu View this record from Arxiv