Název: Experimental research of heterogeneous nuclei in superheated steam
Autoři: Bartoš, Ondřej ; Kolovratník, M. ; Šmíd, Bohuslav ; Hrubý, Jan
Typ dokumentu: Příspěvky z konference
Konference/Akce: Experimental Fluid Mechanics 2015 /10./, Praha (CZ), 2015-11-17 / 2015-11-20
Rok: 2015
Jazyk: eng
Abstrakt: A mobile steam expansion chamber has been developed to investigate experimentally homogeneous and heterogeneous nucleation processes in steam, both in the laboratory and at power plants using the steam withdrawn from the steam turbine. The purpose of the device is to provide new insight into the physics of nonequilibrium wet steam formation, which is one of the factors limiting the efficiency and reliability of steam turbines. The expanded steam or a mixture of steam with a non-condensable gas rapidly expands in the expansion chamber. Due to adiabatic cooling, the temperature drops below the dew point of the steam at a given pressure. When reaching a sufficiently high supersaturation, droplets are nucleated. By tuning the supersaturation in the so-called nucleation pulse, particles of various size ranges can be activated. This fact is used in the present study to measure the aerosol particles present in the air. Homogeneous nucleation was negligible in this case. The experiment demonstrates the functionality of the device, data acquisition system and data evaluation methods.
Klíčová slova: heterogeneous nucleation; steam turbine; ultrafine aerosol particles
Číslo projektu: GAP101/11/1593 (CEP)
Poskytovatel projektu: GA ČR
Zdrojový dokument: Experimental Fluid Mechanics 2015

Instituce: Ústav termomechaniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0254903

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-201376


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav termomechaniky
Konferenční materiály > Příspěvky z konference