Investigation of droplet nucleation in CCS relevant systems – design and testing of the expansion chamber

0481935 - ÚT 2019 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Čenský, Miroslav - Hrubý, Jan - Vinš, Václav - Hykl, Jiří - Šmíd, Bohuslav
Investigation of droplet nucleation in CCS relevant systems – design and testing of the expansion chamber.
EPJ Web of Conferences. Les Ulis: EDP Sciences, 2018 - (Dančová, P.), č. článku 02015. 180. ISSN 2101-6275. E-ISSN 2100-014X.
[Experimental Fluid Mechanics 2017. Mikulov (CZ), 21.11.2017-24.11.2017]
Grant CEP: GA MŠMT(CZ) 7F14466; GA ČR GA16-02647S
Institucionální podpora: RVO:61388998
Klíčová slova: carbon capture and storage * expansion chamber * experiment
Obor OECD: Thermodynamics
https://www.epj-conferences.org/articles/epjconf/abs/2018/15/epjconf_efm2018_02015/epjconf_efm2018_02015.html

A unique in-house designed experimental apparatus for investigation of nucleation of droplets in CCS relevant systems is being developed by the present team. The apparatus allows simulating various processes relevant to CCS technologies. Gaseous mixtures with CO2 are prepared in a Mixture Preparation Device (MPD) based on accurate adjustment of flow rates of individual components [EPJ Web of Conferences 143, 02140 (2017)]. The mixture then flows into an expansion chamber, where it undergoes a rapid adiabatic expansion. As a consequence of adiabatic cooling, the mixture becomes supersaturated and nucleation and simultaneous growth of droplets occurs. In this study, we describe the design and testing of the expansion part of the experimental setup. The rapid expansion was realized using two valve systems, one for low pressures (up to 0.7 MPa) and the other for high pressures (up to 10 MPa). A challenge for a proper design of the expansion system is avoiding acoustic oscillations. These can occur either in the mode of Helmholtz resonator, where the compressible gas in the chamber acts as a spring and the rapidly moving gas in the valve system as a mass, or in the flute mode, where acoustic waves are generated in a long outlet tubing.
Trvalý link: http://hdl.handle.net/11104/0279376