Abstract
The double-diaphragm shock tube technique was applied to the study of homogeneous nucleation for the first time. The condensation of 1% cyclohexane vapor in argon carrier gas was observed by light scattering. The measured “end of condensation” point was shown to yield information similar to that for the “onset of condensation” point observed in nozzle and shock tube driver expansion experiments. The data were fitted to a classical-type nucleation equation by means of an adjustable preexponential factor K. Definitive analysis is not possible at this stage as the surface free energy of small cyclohexane clusters is uncertain under our conditions (temperatures of about 160°K). Experimental nucleation rates were therefore determined for a range of surface free energy values.
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