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Nucleation rates of droplets in supersaturated steam and water vapour-carrier gas mixtures between 200 and 450K
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SYSNO ASEP 0492782 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Nucleation rates of droplets in supersaturated steam and water vapour-carrier gas mixtures between 200 and 450K Author(s) Hrubý, Jan (UT-L) RID, ORCID
Duška, Michal (UT-L) RID, ORCID
Němec, Tomáš (UT-L) RID
Kolovratník, M. (CZ)Number of authors 4 Source Title Proceedings of the Institution of Mechanical Engineers Part A-Journal of Power and Energy. - : Sage - ISSN 0957-6509
Roč. 232, č. 5 (2018), s. 536-549Number of pages 14 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords steam turbines ; nucleation ; non-equilibrium condensation Subject RIV BJ - Thermodynamics OECD category Mechanical engineering R&D Projects 7F14466 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA16-02647S GA ČR - Czech Science Foundation (CSF) LG15040 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UT-L - RVO:61388998 UT WOS 000441038000009 DOI 10.1177/0957650918770939 Annotation We compare experimental nucleation rates for water vapour in various carrier gases, estimated nucleation rates for steam, and nucleation rates obtained from molecular simulations. The data for steam are deduced from empirical adjustments of the classical nucleation theory developed by various authors to reproduce pressure and optical data for condensing steam flows in converging-diverging nozzles and turbine stages. By combining the data for nucleation in carrier gases and the data for steam nucleation, an unprecedented temperature range of 250K is available to study the temperature dependence of nucleation rate. Original results of molecular dynamic simulations for TIP4P/2005 force field in the NVE (system constrained by number of particles, volume and energy) conditions are provided. Correction of classical nucleation theory for non-isothermal nucleation conditions is applied to experimental and simulated data. The nucleation rate data for steam follow a similar temperature trend as the nucleation rate data for water vapour in carrier gases at lower temperatures. The ratio of observed nucleation rates to classical nucleation theory predictions decreases more steeply with temperature than the empirical correlation by Wolk etal. (J Chem Phys 2002, 117: 4954-4960). On the contrary to experimental data, the ratios of nucleation rates computed from molecular simulations to classical nucleation theory predictions do not show a significant temperature trend. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2019
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