scholarly journals Investigation of the homogeneous nucleation of water vapor using a diffusion cloud chamber

1973 ◽  
Vol 59 (2) ◽  
pp. 665-671 ◽  
Author(s):  
Richard H. Heist ◽  
Howard Reiss
Keyword(s):  
Water Vapor ◽  
Homogeneous Nucleation ◽  
Cloud Chamber

Homogeneous Nucleation in Supersaturated Vapors of n-Nonane

1994 ◽  
Vol 59 (2) ◽  
pp. 253-261 ◽  
Author(s):  
Vladimír Ždímal ◽  
Jiří Smolík ◽  
Ivo G. N. Meijer
Keyword(s):  
Surface Tension ◽  
Theoretical Prediction ◽  
Thermal Diffusion ◽  
Homogeneous Nucleation ◽  
Reasonable Agreement ◽  
Cloud Chamber ◽  
Temperature Dependent ◽  
Significant Underestimation

The upward thermal diffusion cloud chamber was used to measure the supersaturations of n-nonane vapors required to cause an observed rate of homogeneous nucleation of 1 droplet/cm3 s. New temperature-dependent correlations for the surface tension and the density of n-nonane have been applied in theoretical prediction of the corresponding supersaturation. The measurements are found to be in reasonable agreement with the predictions of the classical (Becker-Doering) theory whereas both the Dillmann-Meier and the Girshick-Chiu theories lead to a significant underestimation of supersaturation in the whole range of temperatures measured.

How does a Homogeneous Nucleation Event respond to changes of Parameterizations of Water Activity and Saturation Vapor Pressure?

2021 ◽  
Author(s):  
Manuel Baumgartner ◽  
Martina Krämer ◽  
Christian Rolf
Keyword(s):  
Water Vapor ◽  
Water Activity ◽  
Nucleation Rate ◽  
Homogeneous Nucleation ◽  
Saturation Pressure ◽  
Cirrus Clouds ◽  
Ice Crystals ◽  
Nucleation Theory ◽  
Ice Microphysics ◽  
Water Vapor Saturation Pressure

<p>Homogeneous nucleation of ice crystals via freezing of small supercooled solution particles represents a major pathway in the formation of cirrus clouds with high ice water content at low temperatures. A reasonable physical explanation of this type of freezing is provided by Koop's nucleation theory, relating the homogeneous nucleation rate to the water activity of the solution particles. While the homogeneous nucleation rate encodes the probability of freezing of solution particles, the water activity represents the ratio of water vapor saturation pressures over the solution to that over pure water in Koop's portrayal.</p><p>By using the ice microphysics model "CLaMS-Ice", we investigate the effect of various formulations of the water activity and the water vapor saturation pressure on the resulting cirrus clouds. Although CLaMS-Ice is a two-moment bulk model, it implements a comparatively detailed ice microphysics formulated by Spichtinger and Gierens. Such a microphysics scheme is suitable to be implemented in full three dimensional atmospheric models in contrast to even more detailed bin microphysics schemes.</p><p>We performed sensitivity simulations over a wide range of temperatures and vertical velocities by using two different direct parameterizations of water activity based on thermodynamic models in addition to the one used by Koop. Also, three different formulations of the water vapor saturation pressure are applied in the simulations. The results are evaluated regarding the predicted number of ice crystals and the ice onset humidities. In particular, one major finding is that the freezing thresholds are increased compared to Koop's freezing lines.</p>

Track Studies in Water Vapor Using a Low-Pressure Cloud Chamber: II. Microdosimetric Measurements

1993 ◽  
Vol 136 (3) ◽  
pp. 353
Author(s):  
G. P. Stonell ◽  
M. Marshall ◽  
J. A. Simmons
Keyword(s):  
Water Vapor ◽  
Low Pressure ◽  
Cloud Chamber

Track Studies in Water Vapor Using a Low-Pressure Cloud Chamber: I. Macroscopic Measurements

1993 ◽  
Vol 136 (3) ◽  
pp. 341 ◽  
Author(s):  
G. P. Stonell ◽  
M. Marshall ◽  
J. A. Simmons
Keyword(s):  
Water Vapor ◽  
Low Pressure ◽  
Cloud Chamber
Sign in / Sign up

Export Citation Format

Share Document