Homogeneous Nucleation of Water in Synthetic Air

0394252 - ÚT 2014 RIV US eng C - Conference Paper (international conference)
Fransen, M. A. L. J. - Sachteleben, E. - Hrubý, Jan - Smeulders, D. M. J.
Homogeneous Nucleation of Water in Synthetic Air.
AIP Conference Proceedings, Volume 1527. Melville, New York: AIP Publishing, 2013 - (DeMott, P.; O'Dowd, C.), s. 124-127. ISBN 978-0-7354-1152-4. ISSN 0094-243X.
[Nucleation and Atmospheric Aerosols /19./. Fort Collins (US), 23.06.2013-28.06.2013]
R&D Projects: GA ČR(CZ) GAP101/11/1593
Institutional support: RVO:61388998
Keywords : molecular clusters * nucleation * supercooling
Subject RIV: JE - Non-nuclear Energetics, Energy Consumption ; Use

Homogeneous nucleation rates for water vapor in synthetic air are measured by means of a Pulse-Expansion Wave Tube (PEWT). A comparison of the experimental nucleation rates with the Classical Nucleation Theory (CNT) shows that a more elaborated model is necessary to describe supercooled water nucleation at elevated pressures (10 bar). CNT is about 3 orders of magnitude off in case of our measurements. The overall trends, however, are predicted reasonably well by CNT. The size of the critical cluster is predicted to be about 29 water molecules. The size of the critical cluster is obtained experimentally as well using the Nucleation Theorem. The result for water nucleation at a nucleation pressure of 10 bar and nucleation temperature of approximately 238 K is 22 water molecules.
Permanent Link: http://hdl.handle.net/11104/0223471