Original title: Experimental research of heterogeneous nuclei in expansion chamber
Authors: Bartoš, O. ; Hrubý, Jan ; Kolovratník, M.
Document type: Papers
Conference/Event: Wet Stream Conference Prague, Praha (CZ), 20160912
Year: 2016
Language: eng
Abstract: An expansion chamber has been developed to investigate experimentally homogeneous and heterogeneous nucleation processes in steam. A chamber design allows to measure in the laboratory but also in power plants using the steam withdrawn from the steam turbine. The purpose of the device is to provide a new approach to study the physics of non-equilibrium wet steam formation, which is one of the factors limiting the efficiency and reliability of steam turbines. The expanded steam or a known mixture of steam with a non-condensable gas rapidly expands in the expansion chamber. Due to adiabatic cooling, the temperature drops below the actual dew point. 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.
Keywords: expansion chamber; nucleation; wet steam
Host item entry: Wet Stream Conference Prague 2016 - Proceedings, ISBN 978-80-01-5997-5

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0279655

Permalink: http://www.nusl.cz/ntk/nusl-371021


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Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers