Étude expérimentale et numérique des transferts de chaleur en espace annulaire sans débit axial et avec cylindre intérieur tournant

The convective heat transfer between the walls of an annular gap with a rotating inner cylinder are studied experimentally and numerically. Two geometrical configurations are analysed : the surfaces of the cylinders are either smooth, or the moving wall is smooth and the other is axially grooved. The experimental study allowed us to appreciate the increase of heat transfer in the presence of grooves for values of Taylor number up to 2·107. The study of the flow and of the heat transfer has also been conducted by numerical simulation by means of three-dimensional laminar model for the grooved gap, and of an axisymmetric model for the smooth gap. The comparison of numerical and experimental data have shown a good agreement of the Nusselt number for values of Taylor number up to 4 · 105.