Dispersion radiale et axiale dans les écoulements tourbillonnaires de Taylor–Couette et Poiseuille: Radial and axial dispersion in Taylor–Couette and Poiseuille vortex flows

Mass transport in Taylor–Couette and Poiseuille vortex flows has been experimentally investigated by dye injection, particle tracking and electrochemical techniques. An annular cavity has been built with an inner/outer radius ratio of 0.5, with a fixed outer cylinder and a rotating inner one. Without any axial flow, the standard Taylor–Couette flow was observed and the Sherwood number for radial dispersion measured. When a low axial flow rate was imposed (Rea<10), a mechanism for axial dispersion similar to the dispersion of a wave packet was drawn from visualization results.