Échanges convectifs locaux sur une couronne d'un disque en rotation

Abstract

This article sets out an experimental technique for the determination of the local convective heat transfer coefficients on the surface of a rotating disc. This technique is based on the use of thermally thick walls, on infrared thermography as a method of surface temperature determination, and on the numerical solution of the energy equation to evaluate the local convective exchanges. The tests were carried out on a disc with a large temperature difference between its periphery and its interior. The rotational Reynolds number varies from 2·10⁴ to 1.4·10⁶, extending from the laminar to the turbulent regime. The experimental results are compared with the ones taken from the literature and show the influence of the disc geometry and of the nature of the temperature distribution law on its surface on the convective heat transfer.