Campus Units

Mathematics, Mechanical Engineering, Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

1-19-2017

Journal or Book Title

Physical Review E

Volume

95

First Page

012132-1

Last Page

012132-12

DOI

10.1103/PhysRevE.95.012132

Abstract

We perform a tracer counterpermeation (TCP) analysis for a stochastic model of diffusive transport through a narrow linear pore where passing of species within the pore is inhibited or even excluded (single-file diffusion). TCP involves differently labeled but otherwise identical particles from two decoupled infinite reservoirs adsorbing into opposite ends of the pore, and desorbing from either end. In addition to transient behavior, we assess steady-state concentration profiles, spatial correlations, particle number fluctuations, and diffusion fluxes through the pore. From the profiles and fluxes, we determine a generalized tracer diffusion coefficient Dtr(x), at various positions x within the pore. Dtr(x) has a plateau value in the pore center scaling inversely with the pore length, but it is enhanced near the pore openings. The latter feature reflects the effect of fluctuations in adsorption and desorption, and it is also associated with a nontrivial scaling of the concentration profiles near the pore openings.

Comments

This article is from Physical Review E 95 (2017): 012132-1, doi: 10.1103/PhysRevE.95.012132. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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