Nucleation rates of droplets in supersaturated steam and water vapour-carrier gas mixtures between 200 and 450K

0492782 - ÚT 2019 RIV GB eng J - Článek v odborném periodiku
Hrubý, Jan - Duška, Michal - Němec, Tomáš - Kolovratník, M.
Nucleation rates of droplets in supersaturated steam and water vapour-carrier gas mixtures between 200 and 450K.
Proceedings of the Institution of Mechanical Engineers Part A-Journal of Power and Energy. Roč. 232, č. 5 (2018), s. 536-549. ISSN 0957-6509. E-ISSN 2041-2967
Grant CEP: GA MŠMT(CZ) 7F14466; GA ČR GA16-02647S; GA MŠMT(CZ) LG15040
Institucionální podpora: RVO:61388998
Klíčová slova: steam turbines * nucleation * non-equilibrium condensation
Obor OECD: Mechanical engineering
Impakt faktor: 1.694, rok: 2018

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.
Trvalý link: http://hdl.handle.net/11104/0286779