Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Measurements of the Liquid Film Flow Rate in High Pressure Annular Flow 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: HEAT 2005, Gdansk, Poland, June 26–30, 2005, 2005Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
2005.
Keyword [en]
Film flow analysis, Measurements
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-13426OAI: oai:DiVA.org:kth-13426DiVA: diva2:325305
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

Open Access in DiVA

No full text

Authority records BETA

Henryk, Anglart

Search in DiVA

By author/editor
Adamsson, CarlHenryk, Anglart
By organisation
Reactor Technology
Atom and Molecular Physics and Optics

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 105 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf