Homogeneous Nucleation and Growth of Ethanol Drops in Supersonic Flow

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  • Peter P. Wegener
    Department of Engineering and Applied Science, Yale University, New Haven, Connecticut 06520
  • Joseph A. Clumpner
    Department of Engineering and Applied Science, Yale University, New Haven, Connecticut 06520
  • Benjamin J. C. Wu
    Department of Engineering and Applied Science, Yale University, New Haven, Connecticut 06520

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<jats:p>Condensation of ethanol by homogeneous nucleation of liquid droplets has been studied in a supersonic nozzle. Continuous static pressure measurements on the nozzle centerline and light scattering measurements permit the condensation process to be resolved in detail for comparison with theory. Nucleation rates found in the present work are in general agreement with previous results obtained in diffusion and expansion cloud chambers. It is seen that the predictions of the classical theory of homogeneous nucleation or that of the statistical mechanical theory with the assumptions of Dunning roughly agree with the experimental results. Various terms entering different versions of nucleation theory are given quantitatively. The pressure variations in the flow found beyond the onset point of condensation are used to study droplet growth processes. It is shown that a simple kinetic growth law with a constant mass condensation coefficient describes the condensation process well.</jats:p>

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