Analysis of gas entrainment phenomenon from free liquid surface for a sodium-cooled fast reactor design (Velocity profile and Strouhal number in a flow field)

Gas entrainment (GE) from cover gas, which is an inert gas to cover sodium coolant in the reactor vessel, is one of the key issues for Sodium-cooled fast reactors (SFRs) design to prevent unexpected effects to core reactivity. In this research series, evaluation method has been investigated for surf...

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Autores principales: Mao UCHIDA, Takaaki SAKAI, Toshiki EZURE, Masaaki TANAKA
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Lenguaje:EN
Publicado: The Japan Society of Mechanical Engineers 2021
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Acceso en línea:https://doaj.org/article/565212a897644171828b2abfe71a5b22
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spelling oai:doaj.org-article:565212a897644171828b2abfe71a5b222021-11-29T06:09:58ZAnalysis of gas entrainment phenomenon from free liquid surface for a sodium-cooled fast reactor design (Velocity profile and Strouhal number in a flow field)2187-974510.1299/mej.21-00161https://doaj.org/article/565212a897644171828b2abfe71a5b222021-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/4/8_21-00161/_pdf/-char/enhttps://doaj.org/toc/2187-9745Gas entrainment (GE) from cover gas, which is an inert gas to cover sodium coolant in the reactor vessel, is one of the key issues for Sodium-cooled fast reactors (SFRs) design to prevent unexpected effects to core reactivity. In this research series, evaluation method has been investigated for surface dimple depth growth of unstable drifting vortex dimples on the liquid surface in the reactor vessel. By using a computational fluid dynamics (CFD) code, analyses have been conducted to estimate the drifting vortex on water experiments in a circulating water tunnel. The unstable drifting flow vortexes on the water surface were generated as wake vortexes behind a plate obstacle. Downward flow velocity was induced by the bottom slit’s flow passing along the flow channel. In the previous study, the initial conditions of the gas entrainment were evaluated based on existing non-dimensional numbers method by using the STREAM-VIEWER code. However, the CFD predication accuracy of the detailed flow field itself was not clear especially for vortex frequency in the wake flow and detailed velocity profiles in the flow channel. In this study, to clarify the accuracy of CFD analysis, Strouhal numbers of vortex frequency and detailed flow velocity profiles were compared with experimental data which were measured by Particle Image Velocimetry (PIV) method. As the results, the Strouhal numbers of the vortex frequency behind the plate obstacle reasonably agreed with the experimental data.Mao UCHIDATakaaki SAKAIToshiki EZUREMasaaki TANAKAThe Japan Society of Mechanical Engineersarticlesodium-cooled fast reactorsgas entrainmentparticle image velocimetrystrouhal numbercomputational fluid dynamicsMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 4, Pp 21-00161-21-00161 (2021)
institution DOAJ
collection DOAJ
language EN
topic sodium-cooled fast reactors
gas entrainment
particle image velocimetry
strouhal number
computational fluid dynamics
Mechanical engineering and machinery
TJ1-1570
spellingShingle sodium-cooled fast reactors
gas entrainment
particle image velocimetry
strouhal number
computational fluid dynamics
Mechanical engineering and machinery
TJ1-1570
Mao UCHIDA
Takaaki SAKAI
Toshiki EZURE
Masaaki TANAKA
Analysis of gas entrainment phenomenon from free liquid surface for a sodium-cooled fast reactor design (Velocity profile and Strouhal number in a flow field)
description Gas entrainment (GE) from cover gas, which is an inert gas to cover sodium coolant in the reactor vessel, is one of the key issues for Sodium-cooled fast reactors (SFRs) design to prevent unexpected effects to core reactivity. In this research series, evaluation method has been investigated for surface dimple depth growth of unstable drifting vortex dimples on the liquid surface in the reactor vessel. By using a computational fluid dynamics (CFD) code, analyses have been conducted to estimate the drifting vortex on water experiments in a circulating water tunnel. The unstable drifting flow vortexes on the water surface were generated as wake vortexes behind a plate obstacle. Downward flow velocity was induced by the bottom slit’s flow passing along the flow channel. In the previous study, the initial conditions of the gas entrainment were evaluated based on existing non-dimensional numbers method by using the STREAM-VIEWER code. However, the CFD predication accuracy of the detailed flow field itself was not clear especially for vortex frequency in the wake flow and detailed velocity profiles in the flow channel. In this study, to clarify the accuracy of CFD analysis, Strouhal numbers of vortex frequency and detailed flow velocity profiles were compared with experimental data which were measured by Particle Image Velocimetry (PIV) method. As the results, the Strouhal numbers of the vortex frequency behind the plate obstacle reasonably agreed with the experimental data.
format article
author Mao UCHIDA
Takaaki SAKAI
Toshiki EZURE
Masaaki TANAKA
author_facet Mao UCHIDA
Takaaki SAKAI
Toshiki EZURE
Masaaki TANAKA
author_sort Mao UCHIDA
title Analysis of gas entrainment phenomenon from free liquid surface for a sodium-cooled fast reactor design (Velocity profile and Strouhal number in a flow field)
title_short Analysis of gas entrainment phenomenon from free liquid surface for a sodium-cooled fast reactor design (Velocity profile and Strouhal number in a flow field)
title_full Analysis of gas entrainment phenomenon from free liquid surface for a sodium-cooled fast reactor design (Velocity profile and Strouhal number in a flow field)
title_fullStr Analysis of gas entrainment phenomenon from free liquid surface for a sodium-cooled fast reactor design (Velocity profile and Strouhal number in a flow field)
title_full_unstemmed Analysis of gas entrainment phenomenon from free liquid surface for a sodium-cooled fast reactor design (Velocity profile and Strouhal number in a flow field)
title_sort analysis of gas entrainment phenomenon from free liquid surface for a sodium-cooled fast reactor design (velocity profile and strouhal number in a flow field)
publisher The Japan Society of Mechanical Engineers
publishDate 2021
url https://doaj.org/article/565212a897644171828b2abfe71a5b22
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AT takaakisakai analysisofgasentrainmentphenomenonfromfreeliquidsurfaceforasodiumcooledfastreactordesignvelocityprofileandstrouhalnumberinaflowfield
AT toshikiezure analysisofgasentrainmentphenomenonfromfreeliquidsurfaceforasodiumcooledfastreactordesignvelocityprofileandstrouhalnumberinaflowfield
AT masaakitanaka analysisofgasentrainmentphenomenonfromfreeliquidsurfaceforasodiumcooledfastreactordesignvelocityprofileandstrouhalnumberinaflowfield
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