The diffusion of particles trapped in long narrow channels occurs predominantly in one dimension. Here, molecular dynamics simulation is used to study the inertial dynamics of two-dimensional hard disks, confined to long, narrow, structureless channels with hard walls in the no-passing regime. We show that the diffusion coefficient obtained from the mean squared displacement can be mapped onto the exact results for the diffusion of the strictly one-dimensional hard rod system through an effective occupied volume fraction obtained from either the equation of state or a geometric projection of the particle interaction diameters.
@article{arxiv.2001.04099,
title = {Mapping diffusivity of narrow channels into one-dimension},
author = {Mahdi Zarif and Richard K. Bowles},
journal= {arXiv preprint arXiv:2001.04099},
year = {2020}
}