Abstract
Two approximations made in previous treatments modeling the nucleation and growth of molecular clusters generated in nonequilibrium nozzle flow are examined along with the sensitivity of results to uncertainties in input parameters. The first approximation, namely, the assignment of identical temperatures to all clusters at a given point in the flow, was found to be not seriously in error. The kinetics of mass and heat transfer must be suitably taken into account, however, to obtain the correct difference between the cluster temperature and that of the surronding carrier gas. The second approximation, according to which the Kelvin equation is applied to critical nuclei but not subsequently to growing clusters, has an appreciable effect
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