Investigation of the Impurity Transfer Process in the Boundary Layer above a Concave Wall

Abstract

Numerical modeling of the behavior of passive particles (markers) in the boundary layer above a concave surface has been performed. It is shown that, under the influence of longitudinal vortices, they relatively quickly reach the upper boundary of the boundary layer above the tops of the “mushroom” structures. This indicates a significant intensification of heat and mass transfer processes in the presence of a system of longitudinal vortices. We note that the convective transport of a scalar admixture significantly exceeds its propagation under the action of molecular effects. It is important to note that the stems of the “mushroom” structures, along which the markers move away from the wall, are noticeably thinner than the flow region directed towards the wall. This explains the effect of increased heat transfer in the presence of Görtler vortices. It should be noted that the markers were introduced parallel to the transverse coordinate evenly along the segment. Over time, they are concentrated in "mushroom" structures with the same wavelength, and there are no markers between the structures, and the line of these markers becomes wavy with a period equal to the wavelength.