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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The Japan Society of Mechanical Engineers
2021
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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) |
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sodium-cooled fast reactors gas entrainment particle image velocimetry strouhal number computational fluid dynamics Mechanical engineering and machinery TJ1-1570 |
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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 |
work_keys_str_mv |
AT maouchida analysisofgasentrainmentphenomenonfromfreeliquidsurfaceforasodiumcooledfastreactordesignvelocityprofileandstrouhalnumberinaflowfield AT takaakisakai analysisofgasentrainmentphenomenonfromfreeliquidsurfaceforasodiumcooledfastreactordesignvelocityprofileandstrouhalnumberinaflowfield AT toshikiezure analysisofgasentrainmentphenomenonfromfreeliquidsurfaceforasodiumcooledfastreactordesignvelocityprofileandstrouhalnumberinaflowfield AT masaakitanaka analysisofgasentrainmentphenomenonfromfreeliquidsurfaceforasodiumcooledfastreactordesignvelocityprofileandstrouhalnumberinaflowfield |
_version_ |
1718407585699201024 |