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
Identification of Two-Phase Flow Regimes in Unstable Natural Circulation Using TRACE and RELAP5
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-0683-9136
2012 (English)In: Proceedings of The 9th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS-9), 2012, N9P0062- p.Conference paper, Published paper (Refereed)
Abstract [en]

The paper is concerned with validation of system thermal hydraulic (STH) codes TRACE, RELAP5 and identification of flow regimes against experimental data from low pressure CIRCUS-IV facility (Delft University of Technology, The Netherlands) on two-phase natural circulation flow instability. In previous work [1], RELAP5 was validated against the CIRCUS data. The study showed that RELAP5 can predict relatively well the instability in the system. Later, the instantaneous two-phase flow regime identified in simulations was compared with the flow pattern recorded by high-speed camera. It suggested that the flow regime was often misidentified by the code. In this paper, we focus on the effect of flow regime treatment on two-phase flow instability prediction. Both codes are implicitly using concept of flow regime map and correlations obtained for steady state flow conditions. RELAP5 and TRACE have quite different approaches to the treatment of two-phase flow regimes. While RELAP5 has more elaborate flow regime map, TRACE is using an interpolation between bubbly-slug and annular mist flow regimes to simulate all intermediate regimes. Analysis of the codes prediction results sheds new light on the importance of the flow regime in STH codes. We also provide discussion on sensitivity of the predicted unsteady flow to parameters of flow regime treatment.

Place, publisher, year, edition, pages
2012. N9P0062- p.
Keyword [en]
System code, two-phase instability, flow regime
National Category
Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:kth:diva-165394OAI: oai:DiVA.org:kth-165394DiVA: diva2:808232
Conference
9th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS-9), Kaohsiung, Taiwan, September 9-13, 2012
Note

QC 20150506

Available from: 2015-04-27 Created: 2015-04-27 Last updated: 2015-05-06Bibliographically approved

Open Access in DiVA

No full text

Authority records BETA

Kudinov, Pavel

Search in DiVA

By author/editor
Phung, Viet-AnhKudinov, Pavel
By organisation
Nuclear Power Safety
Other Engineering and Technologies

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 110 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