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Theoretical investigation of water vapour condensation in presence of noncondensable gases
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Steam condensation phenomenon plays an important role in many industrial applications. Especially in energy sector this process requires deep understanding. When noncondensable gases are taken into consideration description of the entire phenomenon becomes more complicated. If the surface condensation is taken into consideration this additional species accumulates and creates noncondensable layer near the surface on water vapour condenses. Due to this effect heat and mass transfer rates from gas mixture decreases. Also volume condensation (if it occurs) is affected by the presence of inert gases.

Several examples where the phenomena described above are important can be taken into consideration: studies of accidents in the nuclear power plants where condensation in the volume and condensation on the cold containment’s structures occurs after steam is released due to the pipe brake in the primary loop (especially this is important for PWR’s containments which in normal operation conditions are filled with air or nitrogen); condensation of steam in the pipe systems of BWR reactors where some amount of hydrogen can be accumulated due to the water vapour condensation in nonvented pipes; condensation of steam in the condensers after low pressure stage turbine; etc. Also in other fields, e.g. chemistry or meteorology, the condensation of water vapour in presence of noncondensable species plays very important role.

Diffusion surface condensation model and its implementation into CFX – 4 CFD code has been described in this licentiate thesis. Three different situations have been taken into account: surface condensation of water vapour in presence of air on the vertical wall (computational results have been compared with several commonly used correlations), surface condensation of water vapour in presence of air on the horizontal wall (results have been compared with experimental data), volume condensation in presence of air (known also as spontaneous condensation) – principle of the model has been described and calculation example has been presented and analysed.

Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , 64 p.
Keyword [en]
Technology
Keyword [sv]
TEKNIKVETENSKAP
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-321ISBN: 91-7178-050-0 OAI: oai:DiVA.org:kth-321DiVA: diva2:8987
Presentation
2005-05-19, Sal B1, Brinellvägen 23, Stockholm, 10:00
Note
QC 20100623Available from: 2005-07-20 Created: 2005-07-20 Last updated: 2012-02-14Bibliographically approved
List of papers
1. CFD Modelling of Direct: Contact Condensation in Presence of Non – Condensable Gases on Liquid Film Surface
Open this publication in new window or tab >>CFD Modelling of Direct: Contact Condensation in Presence of Non – Condensable Gases on Liquid Film Surface
2004 (English)Conference paper, Published paper (Other academic)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-13704 (URN)
Conference
42nd European Two Phase Flow Group Meeting
Note

QC 20100623

Available from: 2010-06-23 Created: 2010-06-23 Last updated: 2016-10-05Bibliographically approved
2. CFD Modelling of Wall Condensation in Presence of Non: Condensable gas
Open this publication in new window or tab >>CFD Modelling of Wall Condensation in Presence of Non: Condensable gas
2005 (English)Conference paper, Published paper (Other academic)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-13705 (URN)
External cooperation:
Conference
The 4th International Conference on Transport Phenomena in Multiphase Systems
Note

QC 20100623

Available from: 2010-06-23 Created: 2010-06-23 Last updated: 2016-08-31Bibliographically approved
3. Multidimensional effects in laminar filmwise condensation of vapor in binary and ternary mixtures with non-condensable gases
Open this publication in new window or tab >>Multidimensional effects in laminar filmwise condensation of vapor in binary and ternary mixtures with non-condensable gases
2008 (English)In: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 238, no 6, 1373-1381 p.Article in journal (Refereed) Published
Abstract [en]

This paper is dealing with the multidimensional modelling of gravity driven water vapour free convection condensation from binary and ternary mixtures of condensable and noncondensable gases. In the case of ternary mixtures, a special attention is paid to the influence of the light gas on the transport phenomena in the gaseous phase. Two solution methods have been applied: an analytical solution employing the boundary layer similarity approximation and a numerical solution of multi-fluid, multi-component formulation of the conservation equations. It has been demonstrated that the two methods are equivalent when applied to binary mixtures in simple geometries. However, to capture the spatial effects and the ternary mixture phenomena the latter method must be used.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-7457 (URN)10.1016/j.nucengdes.2007.11.003 (DOI)000256122700010 ()2-s2.0-42249111344 (Scopus ID)
Note

QC 20100623

Available from: 2007-09-10 Created: 2007-09-10 Last updated: 2016-06-09Bibliographically approved

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Citation style
  • apa
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