Experimental and numerical study on transient heat transfer for helium gas flowing over a flat plate containing an exponentially increasing heat source

This study is aimed to obtain fundamental data of transient heat transfer and clarify transient heat transfer process between the surface of solid and the neighboring helium gas in Very High Temperature Reactor (VHTR). Such studies are important for both of the academic knowledge on the complex tran...

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Autores principales:	Zhou ZHAO, Qiusheng LIU, Katsuya FUKUDA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2014
Materias:	transient heat transfer period of heat generation rate numerical solution helium gas forced convection flat plate exponentially increasing Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/7a2b983bcc504bf1b39e77cc654b79d1
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spelling	oai:doaj.org-article:7a2b983bcc504bf1b39e77cc654b79d12021-11-26T06:09:52ZExperimental and numerical study on transient heat transfer for helium gas flowing over a flat plate containing an exponentially increasing heat source2187-974510.1299/mej.2014tep0016https://doaj.org/article/7a2b983bcc504bf1b39e77cc654b79d12014-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/1/4/1_2014tep0016/_pdf/-char/enhttps://doaj.org/toc/2187-9745This study is aimed to obtain fundamental data of transient heat transfer and clarify transient heat transfer process between the surface of solid and the neighboring helium gas in Very High Temperature Reactor (VHTR). Such studies are important for both of the academic knowledge on the complex transient phenomena and the safety assessment of severe nuclear reactor accidents such as power burst, rapid depressurization and withdraw of control rods. In this paper, a series of flat plates with different widths under different pressures inside a circular channel have been experimental tested and numerical analyzed for forced convection transient heat transfer for helium gas flowing over the plate. The heat generation rate of the plate was increased with a function of Q0exp(t/τ) (where t is time and τ is period of heat generation rate or e-fold time). The plates were made of platinum with a thickness of 0.1 mm and widths of 2 mm, 4 mm and 6 mm. Based on the experimental data and our previous research (Liu, et al. 2008a), we found that when the period τ is longer than around 1 second the heat transfer coefficients approach the quasi-steady-state values but when the period is shorter than around 1 second the heat transfer coefficients become higher as the period decreases. In this paper, we found that the conductive heat transfer becomes predominant for the period less than around 1 second and the heat transfer is mainly governed by convection heat transfer in the quasi-steady-state for the period larger than around 1 s. A semi-empirical correlation of surface temperature difference for plate heater was obtained based on the experimental data and analytic results. A 3-dimensional numerical simulation was carried out for the purpose of obtaining the plate temperature changes with time at various periods and velocities. The numerical solutions agree well with the experimental data within 6% differences.Zhou ZHAOQiusheng LIUKatsuya FUKUDAThe Japan Society of Mechanical Engineersarticletransient heat transferperiod of heat generation ratenumerical solutionhelium gasforced convectionflat plateexponentially increasingMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 1, Iss 4, Pp TEP0016-TEP0016 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	transient heat transfer period of heat generation rate numerical solution helium gas forced convection flat plate exponentially increasing Mechanical engineering and machinery TJ1-1570
spellingShingle	transient heat transfer period of heat generation rate numerical solution helium gas forced convection flat plate exponentially increasing Mechanical engineering and machinery TJ1-1570 Zhou ZHAO Qiusheng LIU Katsuya FUKUDA Experimental and numerical study on transient heat transfer for helium gas flowing over a flat plate containing an exponentially increasing heat source
description	This study is aimed to obtain fundamental data of transient heat transfer and clarify transient heat transfer process between the surface of solid and the neighboring helium gas in Very High Temperature Reactor (VHTR). Such studies are important for both of the academic knowledge on the complex transient phenomena and the safety assessment of severe nuclear reactor accidents such as power burst, rapid depressurization and withdraw of control rods. In this paper, a series of flat plates with different widths under different pressures inside a circular channel have been experimental tested and numerical analyzed for forced convection transient heat transfer for helium gas flowing over the plate. The heat generation rate of the plate was increased with a function of Q0exp(t/τ) (where t is time and τ is period of heat generation rate or e-fold time). The plates were made of platinum with a thickness of 0.1 mm and widths of 2 mm, 4 mm and 6 mm. Based on the experimental data and our previous research (Liu, et al. 2008a), we found that when the period τ is longer than around 1 second the heat transfer coefficients approach the quasi-steady-state values but when the period is shorter than around 1 second the heat transfer coefficients become higher as the period decreases. In this paper, we found that the conductive heat transfer becomes predominant for the period less than around 1 second and the heat transfer is mainly governed by convection heat transfer in the quasi-steady-state for the period larger than around 1 s. A semi-empirical correlation of surface temperature difference for plate heater was obtained based on the experimental data and analytic results. A 3-dimensional numerical simulation was carried out for the purpose of obtaining the plate temperature changes with time at various periods and velocities. The numerical solutions agree well with the experimental data within 6% differences.
format	article
author	Zhou ZHAO Qiusheng LIU Katsuya FUKUDA
author_facet	Zhou ZHAO Qiusheng LIU Katsuya FUKUDA
author_sort	Zhou ZHAO
title	Experimental and numerical study on transient heat transfer for helium gas flowing over a flat plate containing an exponentially increasing heat source
title_short	Experimental and numerical study on transient heat transfer for helium gas flowing over a flat plate containing an exponentially increasing heat source
title_full	Experimental and numerical study on transient heat transfer for helium gas flowing over a flat plate containing an exponentially increasing heat source
title_fullStr	Experimental and numerical study on transient heat transfer for helium gas flowing over a flat plate containing an exponentially increasing heat source
title_full_unstemmed	Experimental and numerical study on transient heat transfer for helium gas flowing over a flat plate containing an exponentially increasing heat source
title_sort	experimental and numerical study on transient heat transfer for helium gas flowing over a flat plate containing an exponentially increasing heat source
publisher	The Japan Society of Mechanical Engineers
publishDate	2014
url	https://doaj.org/article/7a2b983bcc504bf1b39e77cc654b79d1
work_keys_str_mv	AT zhouzhao experimentalandnumericalstudyontransientheattransferforheliumgasflowingoveraflatplatecontaininganexponentiallyincreasingheatsource AT qiushengliu experimentalandnumericalstudyontransientheattransferforheliumgasflowingoveraflatplatecontaininganexponentiallyincreasingheatsource AT katsuyafukuda experimentalandnumericalstudyontransientheattransferforheliumgasflowingoveraflatplatecontaininganexponentiallyincreasingheatsource
_version_	1718409784922734592

Experimental and numerical study on transient heat transfer for helium gas flowing over a flat plate containing an exponentially increasing heat source

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