title: Projection of two-dimensional diffusion in a narrow channel onto the longitudinal dimension.
abstract: Diffusion in a narrow two-dimensional channel of width A(x), depending on the longitudinal coordinate x, is the object of our study. We show how the 2+1 dimensional diffusion equation can be projected onto a 1+1 dimensional one, governing corresponding one-dimensional density, in a steady-state approximation. Then we demonstrate the method on a nontrivial exactly solvable case for A(x)=x and discuss projection of the initial condition.
authors.affiliation: Courant Institute of Mathematical Sciences, New York University, New York 10012, USA. kalinay@cims.nyu.edu
authors.forename: P
authors.initials: P
authors.lastname: Kalinay
authors.forename: J K
authors.initials: JK
authors.lastname: Percus