A Coordinate Free Formulation of Effective Diffusion on Channels
Mathematical Physics
2020-08-13 v1 math.MP
Abstract
We study diffusion processes in regions generated by sliding a cross section by the phase flow of vector filed on curved spaces of arbitrary dimension. We do this by studying the effective diffusion coefficient D that arises when trying to reduce the n-dimensional diffusion equation to a 1-dimensional diffusion equation by means of a projection method. We use the mathematical language of exterior calculus to derive a coordinate free formula for this coefficient in both infinite and finite transversal diffusion rate cases. The use of these techniques leads to a formula for D which provides a deeper understanding of effective diffusion than when using a coordinate dependent approach.
Cite
@article{arxiv.2008.05436,
title = {A Coordinate Free Formulation of Effective Diffusion on Channels},
author = {Carlos Valero},
journal= {arXiv preprint arXiv:2008.05436},
year = {2020}
}