Publication detail
Two-phase flow pattern in the mixing chamber of an effervescent atomizers
OTÁHAL, J. SUEHNEL, T. BEYER, M. JÍCHA, M.
Czech title
Typ dvoufázového toku ve směšovací komoře effervescent trysky
English title
Two-phase flow pattern in the mixing chamber of an effervescent atomizers
Type
conference paper
Language
en
Original abstract
This paper deals with an experimental study of the two-phase flow in the mixing chamber of an effervescent atomizer. Not only do operational conditions and media properties affect the process of effervescent atomization but also the pattern (quality) of the two-phase flow. Therefore, it is necessary to describe the phenomena associated with the mixing process. Two-phase flow structure was investigated in a mixing chamber with an inner diameter of 8 mm. During the experiment, the effervescent nozzle was operated in the air pressure range of 1 to 0.5 MPa and mass GLR (Gas-to-liquid- ratio) was between 1 and 25%. Mass flow rates of water ranged from 5 up to 50 gos-1. Since optical measurement techniques fail to provide sufficient quantitative information on the flow structure at higher GLR we applied the conductivity wire-mesh sensor technology to this problem. Therefore, a new miniature wire-mesh sensor for small-diameter tubes was developed. The measuring principle of this sensor is based on the measurement of electrical conductivity in the crossing points of a wire mesh. Due this principle we used a conductive liquid (deionized water). The two-phase flow in the chamber is highly unstable and the wire-mesh sensor provides also data for an evaluation of two-phase flow pulsation.
Czech abstract
Článek se zabývá experimentálním zjišťováním rozložení vody a vzduchu ve směšovací komoře effervescent trysky.
English abstract
This paper deals with an experimental study of the two-phase flow in the mixing chamber of an effervescent atomizer. Not only do operational conditions and media properties affect the process of effervescent atomization but also the pattern (quality) of the two-phase flow. Therefore, it is necessary to describe the phenomena associated with the mixing process. Two-phase flow structure was investigated in a mixing chamber with an inner diameter of 8 mm. During the experiment, the effervescent nozzle was operated in the air pressure range of 1 to 0.5 MPa and mass GLR (Gas-to-liquid- ratio) was between 1 and 25%. Mass flow rates of water ranged from 5 up to 50 gos-1. Since optical measurement techniques fail to provide sufficient quantitative information on the flow structure at higher GLR we applied the conductivity wire-mesh sensor technology to this problem. Therefore, a new miniature wire-mesh sensor for small-diameter tubes was developed. The measuring principle of this sensor is based on the measurement of electrical conductivity in the crossing points of a wire mesh. Due this principle we used a conductive liquid (deionized water). The two-phase flow in the chamber is highly unstable and the wire-mesh sensor provides also data for an evaluation of two-phase flow pulsation.
Keywords in Czech
effervescent tryska, dvoufázový tok, WM- senzor
Keywords in English
effervescent atomizer, two-phase flow, wire-mesh sensor
RIV year
2007
Released
28.11.2007
Publisher
Technical University of Liberec
Location
Liberec
ISBN
978-80-7372-273-9
Book
Experimental fluid mechanics 2007 - Conference Proceedings
Pages from–to
98–104
Pages count
180
BIBTEX
@inproceedings{BUT25365,
author="Jan {Otáhal} and Tobias {Suehnel} and Matthias {Beyer} and Miroslav {Jícha},
title="Two-phase flow pattern in the mixing chamber of an effervescent atomizers",
booktitle="Experimental fluid mechanics 2007 - Conference Proceedings",
year="2007",
month="November",
pages="98--104",
publisher="Technical University of Liberec",
address="Liberec",
isbn="978-80-7372-273-9"
}