Condensation of some organic vapours including ammonia, ethanol and -
fieon-1 1 by homogeneous nucleation of liquid droplets has been studied
here during supersonic flow through convergent-divergent nozzles.
Theoretical model of the present work is based upon three groups of
equations namely: gasdynamic equations, equations of condensation kinetics
and droplets growth equations. Modified equations for the classical
nucleation rate, droplets surface tension and the thermodynamic properties
of the condensing vapour are used in the present theoretical model.
Generally, present model predictions show that condensation characteristics
of the tested organic vapours are qualitatively similar to those of steam
condensation. Also, the present study indicates that the condensation
characteristics of the tested organic vapours are affected with the operating
parameters such as the vapour temperature and its mass fraction. The
theoretical predictions of the pressure variation along the divergent sections
of such supersonic nozzles are in good agreement with the published
experimental measurements of these organic vapours