Establishment of analytical model for peak temperature within a sodium-water reaction jet, (1). Axial temperature profile within an inert hot gas jet injected into a cold liquid

In order to establish an analytical model for the peak temperature within a sodium-water reaction jet, an analytical and theoretical investigation of an inert-hot-gas jet injected into a bath of cold liquid was performed as the first step. The laboratory study involved measurement of the centerline temperatures within hot N₂-gas jets in water and in volatile refrigerant Suva-123. An integral two-fluid (gas + entrained drops) model of the submerged jet was developed in which a single, representative droplet size was employed to treat droplet-to-gas heat and mass exchange. Encouraging agreement with the measured centerline temperatures was obtained by using available information on jet entrainment coefficients. The centerline temperature measurements revealed that fine scale atomization of the entrained liquid occurs in the very near field of the jet and the mist so produced is entirely responsible for the downstream cooling of the submerged jet. The temperature measurements also revealed that water entered and penetrated the injector passage by a distance of about two injector diameters against an essentially sonic gas discharge flow (360 ms^-1). (author)