Non iterative model for steam condensation in presence of non-condensable gases inside passive containment cooling vertical tubes

dc.contributor.authorDe la Rosa, J.C.
dc.contributor.authorMunoz-Cobo, J.L.
dc.contributor.authorEscrivá, A.
dc.date.accessioned2014-12-03T08:42:00Z
dc.date.available2014-12-03T08:42:00Z
dc.date.issued2007
dc.description.abstractPaper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.en_US
dc.description.abstractThe modelling of condensation in presence of non-condensable gases is of relevance for the design of passive containment cooling condenser of the third generation of Passive Nuclear Power Plants. Fast and accurate methods of predictions for condensation in presence of non-condensable gases are necessary in order to be implemented in the thermal-hydraulic codes without slowing down the computational speed of these codes. In this paper we present a mechanistic model for condensation in presence of non-condensable gases inside vertical tubes. In this model we take into account the influence of the non-condensable gases over the liquid side heat transfer without any iteration to calculate the liquid-steam interfacial temperature. The trick is to perform a set of Taylor expansions for the main physical magnitudes as viscosity, steam mass fraction and so on. We also consider the interfacial shear stress exerted by the steam-non-condensable mixture flow over the condensate layer thickness. The calculation of the condensate layer thickness can be performed with the help of the mass, energy and momentum conservation equations and can be achieved without any iteration following the method of Munoz-Cobo et al [1,2]. The new proposed mechanistic model solves explicitly the real interfacial temperature by means of a cubic or a quartic equation depending on the degree of approximation that has been chosen. Moreover, as the main non-condensable effects can be accounted for in the heat and mass transfer processes, the new model will be more realistic. The model has been validated with the Vierow experimental data, obtaining a total average relative error, for the fourth order equation method model, of 21% with 268 experimental points at different conditionsen_US
dc.description.librariancs2014en_US
dc.format.extent9 pagesen_US
dc.format.mediumPDFen_US
dc.identifier.citationDe la Rosa, JC, Munoz-Cobo, JL & Escrivá, A 2007, Non iterative model for steam condensation in presence of non-condensable gases inside passive containment cooling vertical tubes, Paper presented to the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July 2007.en_US
dc.identifier.isbn9781868546435
dc.identifier.urihttp://hdl.handle.net/2263/42775
dc.language.isoenen_US
dc.publisherInternational Conference on Heat Transfer, Fluid Mechanics and Thermodynamicsen_US
dc.relation.ispartofHEFAT 2007
dc.rightsUniversity of Pretoriaen_US
dc.rights.uriUniversity of Pretoriaen_US
dc.subjectNon-condensable gasesen_US
dc.subjectPassive containment cooling condenseren_US
dc.subjectPassive nuclear power plantsen_US
dc.subjectSteam-non-condensable mixture flowen_US
dc.subjectVierow experimental dataen_US
dc.titleNon iterative model for steam condensation in presence of non-condensable gases inside passive containment cooling vertical tubesen_US
dc.typePresentationen_US

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