Condensation of H2O and D2O in Argon in the Centered Expansion Wave in a Shock Tube,
Abstract
Despite gasdynamic non-idealities in the flow produced in a shock tube, pressure measurements at three different locations in the driver section of the shock tube revealed that the expansion wave generated in relatively weak expansions could be viewed effectively as a simple centered expansion fan after an empirical shift of the actual origin of the expansion wave to a 'virtual' origin. The resulting centered expansion fan was used to study at two locations the condensation of H2O and D2O vapors in an excess of the carrier gas argon, with simultaneous pressure and light scattering measurements. The isentropic flow within the centered expansion fan was found to be preserved up to the point of the detectable onset of condensation by tailoring the onset conditions to occur at the tail of the expansion fan, thus rendering a simple analysis of the experiments possible. The onset conditions of H2O vapor were found to be in agreement with previous findings in supersonic nozzles and shock tubes, and they were well predicted by the so-called classical theory of homogeneous nucleation. The condensation of D2O vapor was found to exhibit similar trends as those of H2O vapor condensation despite the slight differences in physical properties between them due to isotopy. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1977
- Accession Number
- ADA035243
Entities
People
- C. F. Lee
Organizations
- Yale University