  An oxidation process is simulated for a bundle of metal tubes in a
cross-flow. A fluid flow is governed by the incompressible Navier-Stokes
equations. To describe the transport of oxygen, the corresponding
convection-diffusion equation is applied. The key point of the model is related
to the description of oxidation processes taking into account the growth of a
thin oxide film in the quasi-stationary approximation. Mathematical modeling of
oxidant transport in a tube bundle is carried out in the 2D approximation. The
numerical algorithm employed in the work is based on the finite-element
discretization in space and the fully implicit discretization in time. The tube
rows of a bundle can be either in-line or staggered in the direction of the
fluid flow velocity. The growth of the oxide film on tube walls is predicted
for various bundle structures using the developed oxidation model.
