Accession Number : AD0772124

Title :   Homogeneous Nucleation of Water Vapor with and without Carrier Gases in a Shock Tube,

Corporate Author : YALE UNIV NEW HAVEN CONN DEPT OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s) : Barschdorff,Dieter

Report Date : SEP 1973

Pagination or Media Count : 48

Abstract : Water vapor condensation is investigated by pressure and light scattering measurements in an expansion wave in the driver section of a shock tube. With this technique, onset conditions of homogeneous nucleation in pure water vapor (steam) and with small mole fractions of H2O within different carrier gases were obtained. Nucleation rate calculations are carried out with a non-isothermal pre-exponential term applied to the classical nucleation rate theory. Results for the transition region of pure vapor and small fractions of water vapor in argon, helium or air demonstrate the dependence of onset conditions on the mass fraction of the carrier gas. (Modified author abstract)

Descriptors :   *Condensation, *Water vapor, *Steam, *Nucleation, Tables(Data), Pressure, Shock tubes, Phase transformations, Light scattering, Rates

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE