PARTICULATE DEPOSIT SHAPE EVOLUTION ON CYLINDERS IN CROSSFLOW AT HIGH STOKES NUMBERS

We present an asymptotic (in the limit of high Stokes number) treatment of the problem of thick deposit growth dynamics due to inertial impaction of particles on cylinders in cross-flow. Results from discrete particle simulations are used to account for the dependence of the sticking fraction of the particles and the microstructure of the resulting deposit on impact velocity magnitude and angle of incidence, while deposit erosion is taken into account employing correlations based on experimental data for brittle ceramic materials. The problem is formulated in terms of a single equation describing the evolution of deposit shape that is solved with the method of lines. Furthermore we present conditions for the existence of steady-state deposit shapes (obtained analytically) and demonstrate the effects of the interplay between deposit microstructure, particle sticking/rebound and deposit erosion on overall deposit shapes.