Physics-basis simulation of bubble pinch-off

In the last two decades, CFD codes have been widely used for the design studies of NPPs. Recently high-precision simulation models have been developed to evaluate complicated phenomena, e.g. fuel melting in severe accident. The authors also are developing a high-precision CFD code with an interface...

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Autores principales:	Kei ITO, Yasuo KOIZUMI, Hiroyuki OHSHIMA, Takumi KAWAMURA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	sodium-cooled fast reactor gas entrainment volume-of-fluid plic bubble pinch-off Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/843a76b9d4114f19b131e8a72be2699c
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id	oai:doaj.org-article:843a76b9d4114f19b131e8a72be2699c
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spelling	oai:doaj.org-article:843a76b9d4114f19b131e8a72be2699c2021-11-26T06:51:31ZPhysics-basis simulation of bubble pinch-off2187-974510.1299/mej.15-00671https://doaj.org/article/843a76b9d4114f19b131e8a72be2699c2016-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/3/3_15-00671/_pdf/-char/enhttps://doaj.org/toc/2187-9745In the last two decades, CFD codes have been widely used for the design studies of NPPs. Recently high-precision simulation models have been developed to evaluate complicated phenomena, e.g. fuel melting in severe accident. The authors also are developing a high-precision CFD code with an interface tracking method to simulate the gas entrainment (GE) phenomena in sodium-cooled fast reactors (SFRs), which might be caused by a highly-intensified free surface vortex. The GE in SFRs is characterized by an elongated interfacial dent along the vortex core and the bubble pinch-off at the tip of the dent. To simulate this complicated phenomenon, the authors’ CFD code has physics-basis algorithms which model accurately the interfacial dynamic behavior, the pressure jump condition at an interface and the surface tension. Several verification problems, e.g. the slotted-disk problem, have been already solved and the accuracy of each individual algorithm is confirmed. In this paper, a basic experiment of the GE is simulated to validate the developed CFD code. In the experiment, the entrained gas flow rate is measured by image processing with a high-speed video camera. The simulation result of the entrained flow rate shows comparable value to the experimental data, that is, our CFD code is considered applicable to the evaluation of the GE in SFRs.Kei ITOYasuo KOIZUMIHiroyuki OHSHIMATakumi KAWAMURAThe Japan Society of Mechanical Engineersarticlesodium-cooled fast reactorgas entrainmentvolume-of-fluidplicbubble pinch-offMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 3, Pp 15-00671-15-00671 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	sodium-cooled fast reactor gas entrainment volume-of-fluid plic bubble pinch-off Mechanical engineering and machinery TJ1-1570
spellingShingle	sodium-cooled fast reactor gas entrainment volume-of-fluid plic bubble pinch-off Mechanical engineering and machinery TJ1-1570 Kei ITO Yasuo KOIZUMI Hiroyuki OHSHIMA Takumi KAWAMURA Physics-basis simulation of bubble pinch-off
description	In the last two decades, CFD codes have been widely used for the design studies of NPPs. Recently high-precision simulation models have been developed to evaluate complicated phenomena, e.g. fuel melting in severe accident. The authors also are developing a high-precision CFD code with an interface tracking method to simulate the gas entrainment (GE) phenomena in sodium-cooled fast reactors (SFRs), which might be caused by a highly-intensified free surface vortex. The GE in SFRs is characterized by an elongated interfacial dent along the vortex core and the bubble pinch-off at the tip of the dent. To simulate this complicated phenomenon, the authors’ CFD code has physics-basis algorithms which model accurately the interfacial dynamic behavior, the pressure jump condition at an interface and the surface tension. Several verification problems, e.g. the slotted-disk problem, have been already solved and the accuracy of each individual algorithm is confirmed. In this paper, a basic experiment of the GE is simulated to validate the developed CFD code. In the experiment, the entrained gas flow rate is measured by image processing with a high-speed video camera. The simulation result of the entrained flow rate shows comparable value to the experimental data, that is, our CFD code is considered applicable to the evaluation of the GE in SFRs.
format	article
author	Kei ITO Yasuo KOIZUMI Hiroyuki OHSHIMA Takumi KAWAMURA
author_facet	Kei ITO Yasuo KOIZUMI Hiroyuki OHSHIMA Takumi KAWAMURA
author_sort	Kei ITO
title	Physics-basis simulation of bubble pinch-off
title_short	Physics-basis simulation of bubble pinch-off
title_full	Physics-basis simulation of bubble pinch-off
title_fullStr	Physics-basis simulation of bubble pinch-off
title_full_unstemmed	Physics-basis simulation of bubble pinch-off
title_sort	physics-basis simulation of bubble pinch-off
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/843a76b9d4114f19b131e8a72be2699c
work_keys_str_mv	AT keiito physicsbasissimulationofbubblepinchoff AT yasuokoizumi physicsbasissimulationofbubblepinchoff AT hiroyukiohshima physicsbasissimulationofbubblepinchoff AT takumikawamura physicsbasissimulationofbubblepinchoff
_version_	1718409729749811200

Physics-basis simulation of bubble pinch-off

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