Document Type

Article

Publication Date

10-1-2002

Publication Title

Journal of Chemical Physics

Abstract

We examined the condensation of H2O, D2O, and four intermediate mixtures (20, 40, 60, and 80 mol % D2O) in a supersonic nozzle. Because the physical and chemical properties of protonated and deuterated water are so similar, this system is ideal for studying the change in condensation behavior as a function of condensible composition. In our experiments dilute mixtures of condensible vapor in N2 are expanded from three different stagnation temperatures resulting in a broad range of onset temperatures (190–238 K) and pressures (27–787 kPa). For a fixed stagnation temperature, the partial pressure required to maintain the onset of condensation at a given location or temperature in the nozzle is consistently higher for H2O than for D2O. In contrast, the supersaturation at fixed onset temperature is usually higher for D2O than for H2O and this difference increases toward lower temperature. The partial pressure at onset for the intermediate mixtures varied linearly between the values observed for the pure components in this ideal system.

Comments

This work was supported by the National Science Foundation, under Grants Nos. CHE-0097896, CHE-0089136,INT-0089897, and by the Donors of the Petroleum Research Fund administered by the American Chemical Society.

DOI

10.1063/1.1502644

Version

Publisher's PDF

Volume

117

Issue

13

Included in

Physics Commons

Share

COinS