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How Ambient Pressure Influences Water Droplet Nucleation at Tropospheric Conditions
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SYSNO ASEP 0349147 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title How Ambient Pressure Influences Water Droplet Nucleation at Tropospheric Conditions Author(s) Hyvärinen, A.-P. (FI)
Brus, David (UCHP-M) RID, SAI, ORCID
Wedekind, J. (ES)
Lihavainen, H. (FI)Source Title Geophysical Research Letters. - : Wiley - ISSN 0094-8276
Roč. 37, - (2010), L21802Number of pages 4 s. Language eng - English Country US - United States Keywords nucleations theories ; ambient pressure ; condensation of droplets Subject RIV CF - Physical ; Theoretical Chemistry CEZ AV0Z40720504 - UCHP-M (2005-2011) UT WOS 000283941700010 DOI 10.1029/2010GL045013 Annotation Nucleation theories typically neglect the influence of the ambient pressure on the condensation of droplets from a supersaturated vapor, despite increasing experimental evidence. We have applied a recently presented model that incorporates this effect to the homogeneous nucleation rates of water at tropospheric conditions. We measured experimental pressure dependent nucleation rates of water in helium at low to intermediate pressures (70-200 kPa) and at temperatures from 240-270 K with the laminar flow diffusion chamber. The observed pressure effect shows a clear positive effect (increasing nucleation rate with increasing pressure) at 270 K and a weaker effect with lower temperatures, consistent with the theory. The experimental pressure effect was more pronounced than predicted by theory. The same principle of the pressure effect should also hold for heterogeneous nucleation of water, which implies that water vapor removal by droplet nucleation of water may be suppressed at tropospheric conditions. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2011
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