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Numerical analysis of solitary wave influence on the filmwise condensation in presence of non - Condensable gases
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.ORCID iD: 0000-0001-5595-1952
2006 (English)In: International Conference on Nuclear Engineering, Proceedings, ICONE, 2006Conference paper (Refereed)
Abstract [en]

This paper is dealing with the analysis of condensation in presence of non-condensable gas on a laminar liquid film falling down on a vertical smooth surface. Particular interest is focused on the influence of solitary waves on the condensation process. Solutions to the pressure, velocity, temperature and additional scalar variable fields are obtained numerically by solving two - dimensional Navier - Stokes equations formulated in a general coordinate system and applying the artificial compressibility method. The whole system of equations together with adequate boundary conditions is implemented using the finite difference method and solved in the Matlab® 7 code. Both implicit Crank - Nicolson and Euler schemes for the time derivatives are initially used and the latter one is chosen as a more stable. All computations are carried out with prescribed geometry for a film and gas domains and a special attention is focused mainly on the modelling of the influence of the interfacial boundary conditions on the heat transfer process between gaseous mixture and liquid phases. Description of the physical, mathematical and numerical models and several examples of the solutions are presented. Conclusions on the wave hydrodynamics influence on the heat transfer during phase change process are drawn. Copyright

Place, publisher, year, edition, pages
, International Conference on Nuclear Engineering, Proceedings, ICONE, 2006
Keyword [en]
Artificial compressibility, Laminar liquid films, Non-condensable gases, Phase change, Time derivatives, Boundary conditions, Finite difference method, Heat transfer, Hydrodynamics, Mathematical models, Navier Stokes equations, Numerical analysis, Condensation
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-155854DOI: 10.1115/ICONE14-89677ScopusID: 2-s2.0-33845776095ISBN: 0791837831ISBN: 9780791837832OAI: diva2:764454
Fourteenth International Conference on Nuclear Engineering 2006, ICONE 14, 17 July 2006 through 20 July 2006, Miami, FL

QC 20141118

Available from: 2014-11-19 Created: 2014-11-13 Last updated: 2015-01-30Bibliographically approved
In thesis
1. Mechanistic Modeling of Water Vapour Condensation in Presence of Noncondensable Gases
Open this publication in new window or tab >>Mechanistic Modeling of Water Vapour Condensation in Presence of Noncondensable Gases
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis concerns the analytical and numerical analysis of the water vapour condensation from the multicomponent mixture of condensable and noncondensable gases in the area of the nuclear reactor thermal-hydraulic safety.

Following an extensive literature review in this field three aspects of the condensation phenomenon have been taken into consideration: a surface condensation, a liquid condensate interaction with gaseous mixtures and a spontaneous condensation in supersaturated mixtures. In all these cases condensation heat and mass transfer rates are significantly dependent on the local mixture intensive parameters like for example the noncondensable species concentration.

In order to analyze the multicomponent mixture distribution in the above-mentioned conditions, appropriate simplified physical and mathematical models have been formulated. Two mixture compositions have been taken into account: a binary mixture of water vapour with heavy noncondensable gas and a ternary mixture with two noncondensable gases with different molecular weights. For the binary mixture a special attention has been focused on the heavy gas accumulation in the near-interface region and the influence of liquid film instabilities on the interface heat and mass transfer phenomena. For the ternary mixture of gases a special attention has been paid to the influence of the light gas and induced buoyancy forces on the condensation heat and mass transfer processes.

Both analytical and numerical methods have been used in order to find solutions to these problems. The analytical part has been performed applying the boundary layer approximation and the similarity method to the system of film and mixture conservation equations. The numerical analysis has been performed with the in-house developed code and commercial CFD software. Performing analytical and CFD calculations it has been found that most important processes which govern the multicomponent gas distribution and condensation heat transfer degradation are directly related to the interaction between interface mass balances and buoyancy forces. It has been observed that if the influence of the liquid film instabilities is taken into consideration the heat transfer enhancement due to the presence of different types of waves is directly related to the internal film hydrodynamics and shows up in the mixture-side heat transfer coefficient. The model developed for the dispersed phase growth shows that degradation of the condensation heat transfer rate, which is a consequence of degradation of the convective mass flux, should be taken into account for highly supersaturated gaseous mixtures and can be captured by combination with the mechanistic CFD surface condensation model.

Keywords: condensation, noncondensable gases, CFD simulation, boundary-layer approximation, binary and ternary mixtures

Place, publisher, year, edition, pages
Stockholm: KTH, 2007
TRITA-FYS, ISSN 0280-316X ; 2007:63
National Category
Other Engineering and Technologies
urn:nbn:se:kth:diva-4483 (URN)978-91-7178-747-7 (ISBN)
Public defence
2007-09-27, FD5, Albanova University Center, Roslagstullsbacken 21, Stockholm, 10:00

QC 20100623

Available from: 2007-09-10 Created: 2007-09-10 Last updated: 2015-01-30Bibliographically approved

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