Homogeneous condensation of water vapor in the nozzle. Comparison with experimental data

The flows of water vapor in the conical nozzle are examined. For example, flows with homogeneous condensation in geometrically similar conical nozzles with critical section radius R = 0.05, 0.01, and 0.002 m and cone half-angle $\alpha$ = arctg (0.05) shows that the kinetic processes violate the gas-dynamic similarity in nozzles. It has been shown that with decreasing geometrical dimensions nozzles condensation process may not be completed. It is shown qualitative and quantitative agreement between the results of calculations on presented a mathematical model with experimental data. It is noted that the methods of fixing the condensation process, based on the pressure deviation and scattering of visible light, can not give accurate data on the start point of the condensation process - the Wilson point. And for fixing the nucleation process at the size of nuclei in the unit and tens angstroms maximum electromagnetic radiation scattering method requires the use of radiation with a comparable or shorter wavelength.