Surface wettability enhancement on oxide film coated-steels due to gamma-ray irradiation

Regarding a severe accident of supercritical water-cooled reactor (SCWR), phase change between subcritical and supercritical conditions is crucial since heat transfer rate changes massively causing a dryout accident. Fundamental knowledge on surface wettability and boiling heat transfer on metals at...

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Autores principales:	Wilson SUSANTO, Tomonori IHARA, Tatsuya HAZUKU, Shinichi MOROOKA, Sho KANO
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	supercritical water-cooled reactor radiation induced surface activation (risa) boiling heat transfer wettability oxide film Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/6584e372003547d8a71e60806be5becc
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spelling	oai:doaj.org-article:6584e372003547d8a71e60806be5becc2021-11-29T05:56:31ZSurface wettability enhancement on oxide film coated-steels due to gamma-ray irradiation2187-974510.1299/mej.19-00585https://doaj.org/article/6584e372003547d8a71e60806be5becc2020-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/3/7_19-00585/_pdf/-char/enhttps://doaj.org/toc/2187-9745Regarding a severe accident of supercritical water-cooled reactor (SCWR), phase change between subcritical and supercritical conditions is crucial since heat transfer rate changes massively causing a dryout accident. Fundamental knowledge on surface wettability and boiling heat transfer on metals at subcritical conditions under radiation are, thus, important in thermal-hydraulic design and safety analysis of reactor core in light water reactors including a supercritical water-cooled reactor. The radiation induced surface activation (RISA) which enhances wettability and anticorrosive effect on the metal surface was first revealed by authors in 1999. In the earlier studies, significant improvements of surface wettability and boiling heat transfer on oxide film coated-materials by the RISA were observed in a room temperature condition. The purpose of this study is to evaluate the effect of oxidized metal and γ-ray irradiation on metal surface wettability in high pressure and high temperature conditions. In this experiment, the test section was pressurized at 12 MPa with nitrogen gas using pressure vessel and was heated up to temperatures of 20, 150, 200, 250 and 290 centigrade. Two types of material; a stainless-304 and austenitic stainless steel named PNC1520, which is considered as a potential material of fuel-cladding tube of the SCWR, were used as specimens. The oxide film on the specimen was formed in supercritical water at 380 centigrade and 22 MPa. About 600 kGy Co-60 γ-ray source was used for irradiation. The results showed that the difference of oxidization on wettability was insignificant at room temperature before γ-ray irradiation while contact angles on the oxidized specimen decreased at high temperatures. The water growth rate on oxidized material slightly lower compare to non-oxidized material. This result suggests oxide film formation on metal surface plays an important role in surface wettability enhancement by the RISA.Wilson SUSANTOTomonori IHARATatsuya HAZUKUShinichi MOROOKASho KANOThe Japan Society of Mechanical Engineersarticlesupercritical water-cooled reactorradiation induced surface activation (risa)boiling heat transferwettabilityoxide filmMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 3, Pp 19-00585-19-00585 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	supercritical water-cooled reactor radiation induced surface activation (risa) boiling heat transfer wettability oxide film Mechanical engineering and machinery TJ1-1570
spellingShingle	supercritical water-cooled reactor radiation induced surface activation (risa) boiling heat transfer wettability oxide film Mechanical engineering and machinery TJ1-1570 Wilson SUSANTO Tomonori IHARA Tatsuya HAZUKU Shinichi MOROOKA Sho KANO Surface wettability enhancement on oxide film coated-steels due to gamma-ray irradiation
description	Regarding a severe accident of supercritical water-cooled reactor (SCWR), phase change between subcritical and supercritical conditions is crucial since heat transfer rate changes massively causing a dryout accident. Fundamental knowledge on surface wettability and boiling heat transfer on metals at subcritical conditions under radiation are, thus, important in thermal-hydraulic design and safety analysis of reactor core in light water reactors including a supercritical water-cooled reactor. The radiation induced surface activation (RISA) which enhances wettability and anticorrosive effect on the metal surface was first revealed by authors in 1999. In the earlier studies, significant improvements of surface wettability and boiling heat transfer on oxide film coated-materials by the RISA were observed in a room temperature condition. The purpose of this study is to evaluate the effect of oxidized metal and γ-ray irradiation on metal surface wettability in high pressure and high temperature conditions. In this experiment, the test section was pressurized at 12 MPa with nitrogen gas using pressure vessel and was heated up to temperatures of 20, 150, 200, 250 and 290 centigrade. Two types of material; a stainless-304 and austenitic stainless steel named PNC1520, which is considered as a potential material of fuel-cladding tube of the SCWR, were used as specimens. The oxide film on the specimen was formed in supercritical water at 380 centigrade and 22 MPa. About 600 kGy Co-60 γ-ray source was used for irradiation. The results showed that the difference of oxidization on wettability was insignificant at room temperature before γ-ray irradiation while contact angles on the oxidized specimen decreased at high temperatures. The water growth rate on oxidized material slightly lower compare to non-oxidized material. This result suggests oxide film formation on metal surface plays an important role in surface wettability enhancement by the RISA.
format	article
author	Wilson SUSANTO Tomonori IHARA Tatsuya HAZUKU Shinichi MOROOKA Sho KANO
author_facet	Wilson SUSANTO Tomonori IHARA Tatsuya HAZUKU Shinichi MOROOKA Sho KANO
author_sort	Wilson SUSANTO
title	Surface wettability enhancement on oxide film coated-steels due to gamma-ray irradiation
title_short	Surface wettability enhancement on oxide film coated-steels due to gamma-ray irradiation
title_full	Surface wettability enhancement on oxide film coated-steels due to gamma-ray irradiation
title_fullStr	Surface wettability enhancement on oxide film coated-steels due to gamma-ray irradiation
title_full_unstemmed	Surface wettability enhancement on oxide film coated-steels due to gamma-ray irradiation
title_sort	surface wettability enhancement on oxide film coated-steels due to gamma-ray irradiation
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/6584e372003547d8a71e60806be5becc
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Surface wettability enhancement on oxide film coated-steels due to gamma-ray irradiation

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