Velocity distribution in the subchannels of a pin bundle with a wrapping wire (Evaluation of the Reynolds number dependence in a three-pin bundle)

A sodium-cooled fast reactor has been designed to attain a high burn-up core in commercialized fast reactor cycle systems. The sodium-cooled fast reactor adopts a wire spacer between fuel pins. The wire spacer performs functions of securing the coolant channel and mixing between subchannels. In high...

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Autores principales:	Kosuke AIZAWA, Tomoyuki HIYAMA, Masahiro NISHIMURA, Akikazu KURIHARA, Katsuji ISHIDA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2021
Materias:	sodium-cooled fast reactor wire wrapped pin bundle velocity distribution subchannel particle image velocimetry Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/484c75449e404143a287beb9c99e089f
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spelling	oai:doaj.org-article:484c75449e404143a287beb9c99e089f2021-11-29T06:09:58ZVelocity distribution in the subchannels of a pin bundle with a wrapping wire (Evaluation of the Reynolds number dependence in a three-pin bundle)2187-974510.1299/mej.20-00547https://doaj.org/article/484c75449e404143a287beb9c99e089f2021-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/4/8_20-00547/_pdf/-char/enhttps://doaj.org/toc/2187-9745A sodium-cooled fast reactor has been designed to attain a high burn-up core in commercialized fast reactor cycle systems. The sodium-cooled fast reactor adopts a wire spacer between fuel pins. The wire spacer performs functions of securing the coolant channel and mixing between subchannels. In high burn-up fuel subassemblies, the fuel pin deformation due to swelling and thermal bowing may decrease the local flow velocity in the subassembly and influence the heat removal capability. Therefore, understanding the flow field in a wire-wrapped pin bundle is important. This study performed particle image velocimetry (PIV) measurements using a wire-wrapped three-pin bundle water model to grasp the flow field in the subchannel under conditions, including the laminar to turbulent regions. The PIV results confirmed that the normalized flow velocity near the wrapping wire in the low Re number condition was relatively decreased compared to that in the high Re number condition. Meanwhile, in the region away from the wrapping wire, the maximum flow velocity was increased by decreasing the Re number. Accordingly, the PIV measurements using the three-pin bundle geometry without the wrapping wire were also conducted to understand the effect of the wrapping wires on the flow field in the subchannel. The results confirmed that the mixing due to the wrapping wire occurred, even in the laminar condition. These experimental results are useful not only for understanding the pin bundle thermal hydraulics, but also for the code validation.Kosuke AIZAWATomoyuki HIYAMAMasahiro NISHIMURAAkikazu KURIHARAKatsuji ISHIDAThe Japan Society of Mechanical Engineersarticlesodium-cooled fast reactorwire wrapped pin bundlevelocity distributionsubchannelparticle image velocimetryMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 4, Pp 20-00547-20-00547 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	sodium-cooled fast reactor wire wrapped pin bundle velocity distribution subchannel particle image velocimetry Mechanical engineering and machinery TJ1-1570
spellingShingle	sodium-cooled fast reactor wire wrapped pin bundle velocity distribution subchannel particle image velocimetry Mechanical engineering and machinery TJ1-1570 Kosuke AIZAWA Tomoyuki HIYAMA Masahiro NISHIMURA Akikazu KURIHARA Katsuji ISHIDA Velocity distribution in the subchannels of a pin bundle with a wrapping wire (Evaluation of the Reynolds number dependence in a three-pin bundle)
description	A sodium-cooled fast reactor has been designed to attain a high burn-up core in commercialized fast reactor cycle systems. The sodium-cooled fast reactor adopts a wire spacer between fuel pins. The wire spacer performs functions of securing the coolant channel and mixing between subchannels. In high burn-up fuel subassemblies, the fuel pin deformation due to swelling and thermal bowing may decrease the local flow velocity in the subassembly and influence the heat removal capability. Therefore, understanding the flow field in a wire-wrapped pin bundle is important. This study performed particle image velocimetry (PIV) measurements using a wire-wrapped three-pin bundle water model to grasp the flow field in the subchannel under conditions, including the laminar to turbulent regions. The PIV results confirmed that the normalized flow velocity near the wrapping wire in the low Re number condition was relatively decreased compared to that in the high Re number condition. Meanwhile, in the region away from the wrapping wire, the maximum flow velocity was increased by decreasing the Re number. Accordingly, the PIV measurements using the three-pin bundle geometry without the wrapping wire were also conducted to understand the effect of the wrapping wires on the flow field in the subchannel. The results confirmed that the mixing due to the wrapping wire occurred, even in the laminar condition. These experimental results are useful not only for understanding the pin bundle thermal hydraulics, but also for the code validation.
format	article
author	Kosuke AIZAWA Tomoyuki HIYAMA Masahiro NISHIMURA Akikazu KURIHARA Katsuji ISHIDA
author_facet	Kosuke AIZAWA Tomoyuki HIYAMA Masahiro NISHIMURA Akikazu KURIHARA Katsuji ISHIDA
author_sort	Kosuke AIZAWA
title	Velocity distribution in the subchannels of a pin bundle with a wrapping wire (Evaluation of the Reynolds number dependence in a three-pin bundle)
title_short	Velocity distribution in the subchannels of a pin bundle with a wrapping wire (Evaluation of the Reynolds number dependence in a three-pin bundle)
title_full	Velocity distribution in the subchannels of a pin bundle with a wrapping wire (Evaluation of the Reynolds number dependence in a three-pin bundle)
title_fullStr	Velocity distribution in the subchannels of a pin bundle with a wrapping wire (Evaluation of the Reynolds number dependence in a three-pin bundle)
title_full_unstemmed	Velocity distribution in the subchannels of a pin bundle with a wrapping wire (Evaluation of the Reynolds number dependence in a three-pin bundle)
title_sort	velocity distribution in the subchannels of a pin bundle with a wrapping wire (evaluation of the reynolds number dependence in a three-pin bundle)
publisher	The Japan Society of Mechanical Engineers
publishDate	2021
url	https://doaj.org/article/484c75449e404143a287beb9c99e089f
work_keys_str_mv	AT kosukeaizawa velocitydistributioninthesubchannelsofapinbundlewithawrappingwireevaluationofthereynoldsnumberdependenceinathreepinbundle AT tomoyukihiyama velocitydistributioninthesubchannelsofapinbundlewithawrappingwireevaluationofthereynoldsnumberdependenceinathreepinbundle AT masahironishimura velocitydistributioninthesubchannelsofapinbundlewithawrappingwireevaluationofthereynoldsnumberdependenceinathreepinbundle AT akikazukurihara velocitydistributioninthesubchannelsofapinbundlewithawrappingwireevaluationofthereynoldsnumberdependenceinathreepinbundle AT katsujiishida velocitydistributioninthesubchannelsofapinbundlewithawrappingwireevaluationofthereynoldsnumberdependenceinathreepinbundle
_version_	1718407582518870016

Velocity distribution in the subchannels of a pin bundle with a wrapping wire (Evaluation of the Reynolds number dependence in a three-pin bundle)

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