Abstract
AbstractCondensation of nitrogen carried in helium was studied in expansion waves of a cryogenic shock tube operated at 77.4 K. Condensation onset was detected by laser light scattering in conjunction with piezoelectric pressure measurements. In contrast to most of the previous studies employing supersonic nozzles or free jet expansions, the shock tube experiments showed condensation at supersaturated states close to phase equilibrium having temperatures from 66 K to 57 K and nitrogen partial pressures from 230 torr to 45 torr. The differences in condensation onset presumably caused by the different experimental conditions such as carrier gas concentrations, cooling rates and supply temperatures cannot be explained on the basis of conventional nucleation theories. It is instead possible to relate these differences qualitatively to the molecular kinetics of nitrogen microcluster formation.
Published Version
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