Original title: The measurement of the heterogeneous particles in the steam
Authors: Bartoš, Ondřej ; Hrubý, Jan ; Ždímal, Vladimír ; Kolovratník, Michal ; Jiříček, I. ; Moravec, Pavel ; Zíková, Naděžda
Document type: Papers
Conference/Event: Výroční konference České aerosolové společnosti /20./, Velké Bílovice (CZ), 20191030
Year: 2019
Language: eng
Abstract: The aim of this extended abstract is to reveal the work done as cooperation between several institutions which was presented and published in recent years (Kolovratník, 2014). The formation of droplets in low-pressure steam turbines has a significant impact on the efficiency of energy conversion due to the strongly nonequilibrium nature of this process . The condensed water also erodes the turbine blades. A very important question is to what extent heterogeneous nucleation contributes to the phase transition process . In the case of heterogeneous nucleation , the number of droplets depends only on the number of h eterogeneous particles in the system, whereas in the case of homogeneous nucleation, the number of created droplets is determined rather by the expansion rate - in a faster expansion, greater supersaturation and more droplets are formed until the released condensation enthalpy quenches the nucleation.\nThe specific number of droplets (number of droplets per unit mass of steam) formed in the turbine can be determined by optical probes, developed first by Walters and later in the Czech Republic improved by Petr and Kolovratník. Until recently, no information was available on the relative importance of heterogeneous nucleation in forming these droplets.
Keywords: heterogeneous nucleation; steam turbine; ultrafine aerosol particles
Project no.: GA17-19798S (CEP), TN01000007
Funding provider: GA ČR, GA TA ČR
Host item entry: Sborník XX. výroční konference České aerosolové společnosti,, ISBN 978-80-270-6416-8

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: http://cas.icpf.cas.cz/download/Sbornik_VKCAS_2019.pdf
Original record: http://hdl.handle.net/11104/0306862

Permalink: http://www.nusl.cz/ntk/nusl-410300


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Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
 Record created 2020-02-28, last modified 2020-03-26


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