Distribution des températures à l'intérieur d'un jet de gaz chaud injecté dans un liquide

The distribution of temperatures in a high generating pressure impingement nitrogen jet submerged in an oil bath is determined by means of thermocouples. An analogy with homogeneous underexpanded jets is used to describe the nature of disturbances in the first portion of this flow. Further away, the radial distribution of the temperature excess can be assimilated to a Gaussian curve, but it remains still very narrow compared to the jet envelope. The axial evolution of the half-property radius is small and the corresponding temperature distributions are never fully self-preserving. The temperature excess at the jet centre decreases less rapidly than that of a homogeneous jet injected into a medium with a different density. Mixing is less effective and it occurs more by the contribution of the heavier phase than by the radial diffusion of the lighter phase. The results are satisfactorily correlated with the ratio of the mass flow densities of the liquid and of the gas.