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Measurements of the Liquid Film Flow Rate in High Pressure Annular Flow with Various Axial Power Distributions
KTH, Skolan för teknikvetenskap (SCI), Fysik, Reaktorteknologi.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Reaktorteknologi.ORCID-id: 0000-0001-5595-1952
2005 (Engelska)Ingår i: HEAT 2005, Gdansk, Poland, June 26–30, 2005, 2005Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

This paper presents film flow measurement technique and the results with uniform power distribution. Based on these measurements it is possible to estimate the critical film thickness. The measured film thickness was plotted versus steam quality and slightlyextrapolated up to the measured critical steam quality. The conclusions werein line with Hewitt et al. (1965), i.e. that the critical film thickness is insignificantly small. This does not contradict e.g. Ueda & Isayama (1981) since the conditions were not the same, but for the flow conditions and heat fluxes that are typical for BWR operation it was concluded that the critical film thickness is, for practical purposes, zero.

Ort, förlag, år, upplaga, sidor
2005.
Nyckelord [en]
Film flow analysis, Measurements
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
URN: urn:nbn:se:kth:diva-13426OAI: oai:DiVA.org:kth-13426DiVA, id: diva2:325305
Anmärkning
QC 20100618Tillgänglig från: 2010-06-18 Skapad: 2010-06-18 Senast uppdaterad: 2010-11-08Bibliografiskt granskad
Ingår i avhandling
1. Dryout and Power Distribution Effects in Boiling Water Reactors
Öppna denna publikation i ny flik eller fönster >>Dryout and Power Distribution Effects in Boiling Water Reactors
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2009. s. x, 42
Serie
Trita-FYS, ISSN 0280-316X ; 2009:59
Nyckelord
Dryout, Film flow analysis, Power distribution, Measurements, Subchannel
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
urn:nbn:se:kth:diva-11343 (URN)978-91-7415-481-8 (ISBN)
Disputation
2009-11-13, Sal FR4, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20100618Tillgänglig från: 2009-10-28 Skapad: 2009-10-28 Senast uppdaterad: 2010-07-19Bibliografiskt granskad
2. Measurements of Film Flow Rate in Heated Tubes with Various Axial Power Distributions
Öppna denna publikation i ny flik eller fönster >>Measurements of Film Flow Rate in Heated Tubes with Various Axial Power Distributions
2006 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: Fysik, 2006. s. vi, 27
Nyckelord
film flow, film thickness, dryout, power distribution, annular flow
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
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
Handledare
Anmärkning
QC 20101108Tillgänglig från: 2006-03-15 Skapad: 2006-03-15 Senast uppdaterad: 2010-11-08Bibliografiskt granskad

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