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Eperimental Investigation of the Liquid Film for Annular Flow in a Tube with Various Axial Power Distributions
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.
KTH, School of Engineering Sciences (SCI), Physics, Reactor Technology.ORCID iD: 0000-0001-5595-1952
2005 (English)In: NURETH 11, Avignon, France, October 2–6, 2005, 2005Conference paper, Published paper (Refereed)
Abstract [en]

This paper was published when the measurements with non-uniform powerdistribution were still ongoing. Therefore only the measurements with uniformand top-peaked power profiles were included. The paper compares the measured data with deposition and entrainmentmodels by Hewitt & Govan (1990) and Okawa et al. (2003). These models are also discussed in Sections 4.2.1 and 4.2.2. The issue of a correct boundarycondition at the onset of annular flow was avoided by starting the integrationof the film flow model from the most upstream measurement point. In this way the net mass exchange rate (deposition less entrainment) could be studied without any initial bias from the boundary condition.The entrainment correlation proposed by Okawa et al. (2003) included a heat flux dependent term to account for boiling entrainment (Section 4.2.2). Paper 2 concludes that the model agrees better with measurements if this term is omitted. The result suggests that boiling entrainment may not be an important effect at the investigated conditions.

Place, publisher, year, edition, pages
2005.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-13428OAI: oai:DiVA.org:kth-13428DiVA: diva2:325307
Note
QC 20100618Available from: 2010-06-18 Created: 2010-06-18 Last updated: 2010-11-08Bibliographically approved
In thesis
1. Dryout and Power Distribution Effects in Boiling Water Reactors
Open this publication in new window or tab >>Dryout and Power Distribution Effects in Boiling Water Reactors
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Film flow measurements at several axial positions in round pipes with variousaxial power distributions are presented for conditions corresponding to normaloperation of a BWR. It is confirmed that the film flow rate approaches zero atthe onset of dryout. Selected phenomenological models of annular two-phaseflow are shown to reasonably reproduce the measurements. It is concluded thatmodels are in better agreement with measurements if terms corresponding topossible boiling induced entrainment are excluded.

A method to perform film flow analysis in subchannels as a post-processto a standard two-field subchannel code is suggested. It is shown that thisapproach may yield accurate prediction of dryout power in rod bundles to alow computational cost and that the influence of the power distribution is wellpredicted by the model.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. x, 42 p.
Series
Trita-FYS, ISSN 0280-316X ; 2009:59
Keyword
Dryout, Film flow analysis, Power distribution, Measurements, Subchannel
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-11343 (URN)978-91-7415-481-8 (ISBN)
Public defence
2009-11-13, Sal FR4, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100618Available from: 2009-10-28 Created: 2009-10-28 Last updated: 2010-07-19Bibliographically approved
2. Measurements of Film Flow Rate in Heated Tubes with Various Axial Power Distributions
Open this publication in new window or tab >>Measurements of Film Flow Rate in Heated Tubes with Various Axial Power Distributions
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Measurements of film mass flow rate for annular, diabatic steam-water flow in tubes are presented. The measurements were carried out with four axial power distributions and at several axial positions at conditions typical for boiling water reactors, i.e. 7 MPa pressure and total mass flux in a range from 750 to 1750 kg/m2s. The results show that the influence of the axial power distribution on the dryout power corresponds to a consistent tendency in the film flow rate and that the film tends to zero when dryout is approached. Furthermore it is demonstrated that two selected phenomenological models of annular flow well predict the present data. A model for additional entrainment due to boiling is shown to degrade the predictions.

Place, publisher, year, edition, pages
Stockholm: Fysik, 2006. vi, 27 p.
Keyword
film flow, film thickness, dryout, power distribution, annular flow
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-3881 (URN)91-7178-279-6 (ISBN)
Presentation
2006-03-13, sem.rum 112:028, AlbaNova, Roslagstullbacken 11, Stockholm, 10:10
Opponent
Supervisors
Note
QC 20101108Available from: 2006-03-15 Created: 2006-03-15 Last updated: 2010-11-08Bibliographically approved

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