Two-dimensional diffusion in a Stefan tube: The classical approach

▸ Classical approach is used to model two-dimensional mass transport in a Stefan tube. ▸ The Navier-Stokes equations are solved numerically using a finite difference method. ▸ A diffusion creep (slip) boundary condition is used on the side walls. ▸ Comparison with a published solution using the Kerkhof-Geboers transport equations. ▸ Difficulties with the Kerkhof-Geboers solution are discussed.