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Condensation of SF6 carried in argon by homogeneous nucleation has been studied experimentally in two continuously operating supersonic wind tunnels. Condensation onset was detected by Rayleigh light scattering. Calibration of the nozzles by static pressure measurements, together with a solution of equations of motion allowing for the caloric nonideality of the vapor, permitted the determination of the thermodynamic state at the observed onset of condensation. The experiments covered conditions of condensation onset in a range 77<T<113 K, and 0.09<pSF6<4.6 torr, well below the triple point of SF6. The adiabatic supercooling ranged from 38 to 45 C and the results agree qualitatively with the classical theory of homogeneous nucleation.

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Articles you may be interested inCluster characterization in supersonic nozzles using semi-empirical modeling of non-equilibrium condensation flow A cryogenic supersonic nozzle apparatus to study homogeneous nucleation of Ar and other simple molecules Rev. Sci. Instrum. 79, 114101 (2008); 10.1063/1.3006002 Homogeneous nucleation of argon in an unsteady hypersonic flow field

Experiments and the theory of homogeneous nucleation of nine vapours are compared on a unified basis. It seems that some of the gasdynamic experiments apparently yield nucleation rates that are much higher than those predicted by classical theory. However, a number of these results may have been caused by binary nucleation effects. Such effects are further discussed with experimental results for three binary systems. Problems and uncertainties associated with nucleation research are emphasized.