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THE CONDENSATION OF WATER VAPOUR IN A MIXTURE CONTAINING A HIGH CONCENTRATION OF NON-CONDENSABLE GAS IN A VERTICAL TUBE

Authors :
Jan Havlík
Tomáš Dlouhý
Jakub Krempaský
Source :
Acta Polytechnica, Vol 60, Iss 3, Pp 235-242 (2020)
Publication Year :
2020
Publisher :
CTU Central Library, 2020.

Abstract

This paper deals with the condensation of water vapour possessing a content of noncondensable gas in vertical tubes. The condensation of pure steam on a vertical surface is introduced by the Nusselt condensation model. However, the condensation of water vapour in a mixture with non-condensable gas differs from pure vapour condensation and is a much more complex process. The differences for the condensation of water vapour in a mixture containing a high concentration were theoretically analysed and evaluated. In order to investigate these effects, an experimental stand was built. Experiments were carried out in regards to the case of pure steam condensation and the condensation of water vapour with a non-condensable gas mixture to evaluate the influence of the variable non-condensable gas content during the process. A non-condensable gas in a mixture with steam decreases the intensity of the condensation and the condensation heat transfer coefficient. A gradual reduction of the volume and partial pressure of steam in the mixture causes a decrease in the condensation temperature of steam, and the temperature difference between steam and cooling water. The increasing non-condensable gas concentration restrains the transportation of steam towards the tube wall and this has a significant effect on the decrease in the condensation rate.

Details

Language :
English
ISSN :
12102709 and 18052363
Volume :
60
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Acta Polytechnica
Publication Type :
Academic Journal
Accession number :
edsdoj.5a040cb03bb84588b0e4f9661820e6a8
Document Type :
article
Full Text :
https://doi.org/10.14311/AP.2020.60.0235