The effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube

Abstract This study is conducted to investigate the effect of off-center placement of twisted tape on flow distribution and heat transfer in a circular tube. The effect of tape width of 20, 18, 16, 14 and 12 mm on the heat transfer performance is discussed under the same twist ratio of 2.0. The nume...

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Autores principales:	Li Wang, Peiyong Ni, Guannan Xi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6825a7a932644c778e218578ed6a4654
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spelling	oai:doaj.org-article:6825a7a932644c778e218578ed6a46542021-12-02T16:36:12ZThe effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube10.1038/s41598-021-86285-02045-2322https://doaj.org/article/6825a7a932644c778e218578ed6a46542021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86285-0https://doaj.org/toc/2045-2322Abstract This study is conducted to investigate the effect of off-center placement of twisted tape on flow distribution and heat transfer in a circular tube. The effect of tape width of 20, 18, 16, 14 and 12 mm on the heat transfer performance is discussed under the same twist ratio of 2.0. The numerical analysis of the flow field, average Nusselt number, friction factor and thermo-hydraulic performance parameter of the tube are discussed with Reynolds number ranged from 2600 to 8760. The results indicate that the Nusselt number of the tube fitted with center-placed twisted tapes at various width is 7–51% higher than the plain tube, and performance in low Reynolds region was found more effective than that in high Reynolds region. The heat transfer for circular tube with twisted tape attached to the wall shows better performance than that for the tube with center-placed twisted tape. With a smaller tape width, a higher increasing ratio of Nu-wall/Nu-center is obtained. The increasing ratio for Nusselt number ranged from 3 to 18%. However, the use of twisted tape inserts is not beneficial for energy saving. The thermo-hydraulic performance parameters for convective heat transfer of helium gas flowing in a circular tube are below unity for the calculated Reynolds region.Li WangPeiyong NiGuannan XiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Li Wang Peiyong Ni Guannan Xi The effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube
description	Abstract This study is conducted to investigate the effect of off-center placement of twisted tape on flow distribution and heat transfer in a circular tube. The effect of tape width of 20, 18, 16, 14 and 12 mm on the heat transfer performance is discussed under the same twist ratio of 2.0. The numerical analysis of the flow field, average Nusselt number, friction factor and thermo-hydraulic performance parameter of the tube are discussed with Reynolds number ranged from 2600 to 8760. The results indicate that the Nusselt number of the tube fitted with center-placed twisted tapes at various width is 7–51% higher than the plain tube, and performance in low Reynolds region was found more effective than that in high Reynolds region. The heat transfer for circular tube with twisted tape attached to the wall shows better performance than that for the tube with center-placed twisted tape. With a smaller tape width, a higher increasing ratio of Nu-wall/Nu-center is obtained. The increasing ratio for Nusselt number ranged from 3 to 18%. However, the use of twisted tape inserts is not beneficial for energy saving. The thermo-hydraulic performance parameters for convective heat transfer of helium gas flowing in a circular tube are below unity for the calculated Reynolds region.
format	article
author	Li Wang Peiyong Ni Guannan Xi
author_facet	Li Wang Peiyong Ni Guannan Xi
author_sort	Li Wang
title	The effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube
title_short	The effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube
title_full	The effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube
title_fullStr	The effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube
title_full_unstemmed	The effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube
title_sort	effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6825a7a932644c778e218578ed6a4654
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The effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube

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