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How Ambient Pressure Influences Water Droplet Nucleation at Tropospheric Conditions
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SYSNO ASEP 0349147 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název How Ambient Pressure Influences Water Droplet Nucleation at Tropospheric Conditions Tvůrce(i) Hyvärinen, A.-P. (FI)
Brus, David (UCHP-M) RID, SAI, ORCID
Wedekind, J. (ES)
Lihavainen, H. (FI)Zdroj.dok. Geophysical Research Letters. - : Wiley - ISSN 0094-8276
Roč. 37, - (2010), L21802Poč.str. 4 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova nucleations theories ; ambient pressure ; condensation of droplets Vědní obor RIV CF - Fyzikální chemie a teoretická chemie CEZ AV0Z40720504 - UCHP-M (2005-2011) UT WOS 000283941700010 DOI 10.1029/2010GL045013 Anotace 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. Pracoviště Ústav chemických procesů Kontakt Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Rok sběru 2011
Počet záznamů: 1