Study on Convective Heat Transfer of Supercritical Nitrogen in a Vertical Tube for Liquid Air Energy Storage

The convective heat transfer behavior of supercritical nitrogen (S-N<sub>2</sub>) has played a significant role in optimizing the design of recently emerging cryogenic cold storage and recovery systems. However, studies on S-N<sub>2</sub> heat transfer have been relatively sc...

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Autores principales:	Qinghua Yu, Yuxiang Peng, Ciprian Constantin Negoescu, Yi Wang, Yongliang Li
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	supercritical nitrogen convective heat transfer energy storage effective thermal conductivity CFD simulation Technology T
Acceso en línea:	https://doaj.org/article/0432144633754af3b3c11b7627293cbb
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spelling	oai:doaj.org-article:0432144633754af3b3c11b7627293cbb2021-11-25T17:28:41ZStudy on Convective Heat Transfer of Supercritical Nitrogen in a Vertical Tube for Liquid Air Energy Storage10.3390/en142277731996-1073https://doaj.org/article/0432144633754af3b3c11b7627293cbb2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7773https://doaj.org/toc/1996-1073The convective heat transfer behavior of supercritical nitrogen (S-N<sub>2</sub>) has played a significant role in optimizing the design of recently emerging cryogenic cold storage and recovery systems. However, studies on S-N<sub>2</sub> heat transfer have been relatively scarce, not to mention that there is a legitimate urge for a robust numerical model to accurately predict and explain S-N<sub>2</sub> heat transfer under various working conditions. In this paper, both experimental and numerical studies were conducted for convective heat transfer of S-N<sub>2</sub> in a small vertical tube. The results demonstrated that the standard <i>k</i>-<i>ε</i> model performed better for predicting the key heat transfer characteristics of S-N<sub>2</sub> than the SST <i>k</i>-<i>ω</i> model. The effects of heat flux and inlet pressure on the heat transfer characteristics under a large mass flux were evaluated. The variation mechanisms of local heat transfer performance were revealed by illustrating radial profiles of thermophysical properties and turbulent parameters of N<sub>2</sub>. It was found that the local performance variation along the flow direction was mainly determined by the radial profile of specific heat while the variation of the best local performance with the ratio of heat flux to mass flux was mainly determined by the radial profile of turbulent viscosity.Qinghua YuYuxiang PengCiprian Constantin NegoescuYi WangYongliang LiMDPI AGarticlesupercritical nitrogenconvective heat transferenergy storageeffective thermal conductivityCFD simulationTechnologyTENEnergies, Vol 14, Iss 7773, p 7773 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	supercritical nitrogen convective heat transfer energy storage effective thermal conductivity CFD simulation Technology T
spellingShingle	supercritical nitrogen convective heat transfer energy storage effective thermal conductivity CFD simulation Technology T Qinghua Yu Yuxiang Peng Ciprian Constantin Negoescu Yi Wang Yongliang Li Study on Convective Heat Transfer of Supercritical Nitrogen in a Vertical Tube for Liquid Air Energy Storage
description	The convective heat transfer behavior of supercritical nitrogen (S-N<sub>2</sub>) has played a significant role in optimizing the design of recently emerging cryogenic cold storage and recovery systems. However, studies on S-N<sub>2</sub> heat transfer have been relatively scarce, not to mention that there is a legitimate urge for a robust numerical model to accurately predict and explain S-N<sub>2</sub> heat transfer under various working conditions. In this paper, both experimental and numerical studies were conducted for convective heat transfer of S-N<sub>2</sub> in a small vertical tube. The results demonstrated that the standard <i>k</i>-<i>ε</i> model performed better for predicting the key heat transfer characteristics of S-N<sub>2</sub> than the SST <i>k</i>-<i>ω</i> model. The effects of heat flux and inlet pressure on the heat transfer characteristics under a large mass flux were evaluated. The variation mechanisms of local heat transfer performance were revealed by illustrating radial profiles of thermophysical properties and turbulent parameters of N<sub>2</sub>. It was found that the local performance variation along the flow direction was mainly determined by the radial profile of specific heat while the variation of the best local performance with the ratio of heat flux to mass flux was mainly determined by the radial profile of turbulent viscosity.
format	article
author	Qinghua Yu Yuxiang Peng Ciprian Constantin Negoescu Yi Wang Yongliang Li
author_facet	Qinghua Yu Yuxiang Peng Ciprian Constantin Negoescu Yi Wang Yongliang Li
author_sort	Qinghua Yu
title	Study on Convective Heat Transfer of Supercritical Nitrogen in a Vertical Tube for Liquid Air Energy Storage
title_short	Study on Convective Heat Transfer of Supercritical Nitrogen in a Vertical Tube for Liquid Air Energy Storage
title_full	Study on Convective Heat Transfer of Supercritical Nitrogen in a Vertical Tube for Liquid Air Energy Storage
title_fullStr	Study on Convective Heat Transfer of Supercritical Nitrogen in a Vertical Tube for Liquid Air Energy Storage
title_full_unstemmed	Study on Convective Heat Transfer of Supercritical Nitrogen in a Vertical Tube for Liquid Air Energy Storage
title_sort	study on convective heat transfer of supercritical nitrogen in a vertical tube for liquid air energy storage
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/0432144633754af3b3c11b7627293cbb
work_keys_str_mv	AT qinghuayu studyonconvectiveheattransferofsupercriticalnitrogeninaverticaltubeforliquidairenergystorage AT yuxiangpeng studyonconvectiveheattransferofsupercriticalnitrogeninaverticaltubeforliquidairenergystorage AT ciprianconstantinnegoescu studyonconvectiveheattransferofsupercriticalnitrogeninaverticaltubeforliquidairenergystorage AT yiwang studyonconvectiveheattransferofsupercriticalnitrogeninaverticaltubeforliquidairenergystorage AT yongliangli studyonconvectiveheattransferofsupercriticalnitrogeninaverticaltubeforliquidairenergystorage
_version_	1718412265617620992

Study on Convective Heat Transfer of Supercritical Nitrogen in a Vertical Tube for Liquid Air Energy Storage

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