Natural convection heat transfer from a vertical cylinder in liquid sodium

Natural convection heat transfer from a vertical cylinder in liquid sodium was experimentally studied. Two test cylinders of different dimensions were used. They were 7.62 and 17.51 mm in diameter, and 186 and 257 mm in heated length, respectively. The surface heat flux was ranged from 2×104 to 2×10...

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Autores principales:	Koichi HATA, Yuto TAKEUCHI, Katsuhiko HAMA, Masahiro SHIOTSU, Yasuyuki SHIRAI, Katsuya FUKUDA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2014
Materias:	natural convection heat transfer vertical cylinder liquid sodium Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/291d4e4685984e4bb4ac3d5b5e1e971f
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spelling	oai:doaj.org-article:291d4e4685984e4bb4ac3d5b5e1e971f2021-11-26T06:01:53ZNatural convection heat transfer from a vertical cylinder in liquid sodium2187-974510.1299/mej.2014tep0003https://doaj.org/article/291d4e4685984e4bb4ac3d5b5e1e971f2014-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/1/1/1_2014tep0003/_pdf/-char/enhttps://doaj.org/toc/2187-9745Natural convection heat transfer from a vertical cylinder in liquid sodium was experimentally studied. Two test cylinders of different dimensions were used. They were 7.62 and 17.51 mm in diameter, and 186 and 257 mm in heated length, respectively. The surface heat flux was ranged from 2×104 to 2×106 W/m2 at the bulk liquid temperatures of 673, 773 and 873 K. The local heat transfer coefficients on the cylinders were obtained systematically at various heights, x, from the leading edge of the heated section. On the other hand, theoretical equations for laminar natural convection heat transfer from a vertical cylinder were numerically solved by using PHOENICS code for the same conditions as the experimental ones considering the temperature dependence of thermo-physical properties concerned. The local Nusselt numbers, Nux, on the vertical cylinders obtained experimentally were compared with the corresponding theoretical values on the Nux versus modified local Rayleigh number, Rf [=Grx*Pr2/(4+9Pr1/2+10Pr)], graph. The experimental values of Nux are almost in agreement with the corresponding theoretical values of Nux with the deviations less than 20 % for the range of Rf tested here. The Nux on the rod diameter of a heat exchanger for a power plant, D=31.8 mm, were numerically analyzed by using this code. A correlation, which can describe the effects of the cylinder diameter and the cylinder height, was given based on the experimental and theoretical values. This correlation can describe the experimental and theoretical values of Nux for Rf ranging from 1.5×102 to 4.7×106 within 20 % difference.Koichi HATAYuto TAKEUCHIKatsuhiko HAMAMasahiro SHIOTSUYasuyuki SHIRAIKatsuya FUKUDAThe Japan Society of Mechanical Engineersarticlenatural convection heat transfervertical cylinderliquid sodiumMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 1, Iss 1, Pp TEP0003-TEP0003 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	natural convection heat transfer vertical cylinder liquid sodium Mechanical engineering and machinery TJ1-1570
spellingShingle	natural convection heat transfer vertical cylinder liquid sodium Mechanical engineering and machinery TJ1-1570 Koichi HATA Yuto TAKEUCHI Katsuhiko HAMA Masahiro SHIOTSU Yasuyuki SHIRAI Katsuya FUKUDA Natural convection heat transfer from a vertical cylinder in liquid sodium
description	Natural convection heat transfer from a vertical cylinder in liquid sodium was experimentally studied. Two test cylinders of different dimensions were used. They were 7.62 and 17.51 mm in diameter, and 186 and 257 mm in heated length, respectively. The surface heat flux was ranged from 2×104 to 2×106 W/m2 at the bulk liquid temperatures of 673, 773 and 873 K. The local heat transfer coefficients on the cylinders were obtained systematically at various heights, x, from the leading edge of the heated section. On the other hand, theoretical equations for laminar natural convection heat transfer from a vertical cylinder were numerically solved by using PHOENICS code for the same conditions as the experimental ones considering the temperature dependence of thermo-physical properties concerned. The local Nusselt numbers, Nux, on the vertical cylinders obtained experimentally were compared with the corresponding theoretical values on the Nux versus modified local Rayleigh number, Rf [=Grx*Pr2/(4+9Pr1/2+10Pr)], graph. The experimental values of Nux are almost in agreement with the corresponding theoretical values of Nux with the deviations less than 20 % for the range of Rf tested here. The Nux on the rod diameter of a heat exchanger for a power plant, D=31.8 mm, were numerically analyzed by using this code. A correlation, which can describe the effects of the cylinder diameter and the cylinder height, was given based on the experimental and theoretical values. This correlation can describe the experimental and theoretical values of Nux for Rf ranging from 1.5×102 to 4.7×106 within 20 % difference.
format	article
author	Koichi HATA Yuto TAKEUCHI Katsuhiko HAMA Masahiro SHIOTSU Yasuyuki SHIRAI Katsuya FUKUDA
author_facet	Koichi HATA Yuto TAKEUCHI Katsuhiko HAMA Masahiro SHIOTSU Yasuyuki SHIRAI Katsuya FUKUDA
author_sort	Koichi HATA
title	Natural convection heat transfer from a vertical cylinder in liquid sodium
title_short	Natural convection heat transfer from a vertical cylinder in liquid sodium
title_full	Natural convection heat transfer from a vertical cylinder in liquid sodium
title_fullStr	Natural convection heat transfer from a vertical cylinder in liquid sodium
title_full_unstemmed	Natural convection heat transfer from a vertical cylinder in liquid sodium
title_sort	natural convection heat transfer from a vertical cylinder in liquid sodium
publisher	The Japan Society of Mechanical Engineers
publishDate	2014
url	https://doaj.org/article/291d4e4685984e4bb4ac3d5b5e1e971f
work_keys_str_mv	AT koichihata naturalconvectionheattransferfromaverticalcylinderinliquidsodium AT yutotakeuchi naturalconvectionheattransferfromaverticalcylinderinliquidsodium AT katsuhikohama naturalconvectionheattransferfromaverticalcylinderinliquidsodium AT masahiroshiotsu naturalconvectionheattransferfromaverticalcylinderinliquidsodium AT yasuyukishirai naturalconvectionheattransferfromaverticalcylinderinliquidsodium AT katsuyafukuda naturalconvectionheattransferfromaverticalcylinderinliquidsodium
_version_	1718409768003960832

Natural convection heat transfer from a vertical cylinder in liquid sodium

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