Self diffusion coefficients for the two tracers In114 and Sn113 in the liquid alloy indium-tin at the eutectic composition have been measured as a function of temperature in the range 200°C–450°C. The customary Arrhenius equation is used to describe the experimental results. For indium as a tracer we obtained D=(42.5±5.7) 10−5 exp(−2771±158RT)cm2/sec,and for tin D=(11.7±1.7) 10−5 exp(−1380±156RT)cm2/sec. It is possible that the large difference between the two activation energies could be associated with properties of the eutectic composition.
At ONERA Fauga-Mauzac center, a new air-breathing propulsion test setup, Prométhée-LACOM, has been recently developed. In this paper, both nonreacting and reacting two-phase flows (nonpremixed spray) were investigated. Under reactive conditions, simultaneous OH-PLIF (planar laser-induced fluorescence) and Mie scattering imaging were implemented in order to characterize the spray flame structure. The different behaviors observed in this study seem to support the existence of spray combustion regimes. Moreover, statistical analysis was performed on the spatial distribution of droplets and indicated that the center-to-center interdroplet distance (nearest neighbor) could be described by means of a perfectly random distribution.
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