HOMOGENEOUS NUCLEATION OF SUPERSATURATED WATER VAPOR IN NOZZLES.
MASSACHUSETTS INST OF TECH CAMBRIDGE GAS TURBINE LAB
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Existing data on the condensation of seam and moist air in supersonic nozzles are compared with predictions based on nucleation and drop growth theory. The effects of uncertainties in cluster surface energy and also of the large corrections to nucleation theory due to the gasification concept are examined. It is concluded that if the surface tension is assumed independent of curvature and the classical liquid drop theory based on a stationary liquid drop is used, the theory is in general agreement with the data. The gasification correction is in accord with experimental data only if the surface tension is considered to rise significantly with curvature as predicted by Oriani and Sundquist and others. In neither case can the Tolman or Kirkwood-Buff equations be supported. A review of existing data shows that there is some question as to the appropriate value of the condensation coefficient but this is of little consequence as long as the accommodation coefficient for the liquid-vapor surface is taken to be unity. Author