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The effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube
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 ana...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7994558/ https://www.ncbi.nlm.nih.gov/pubmed/33767256 http://dx.doi.org/10.1038/s41598-021-86285-0 |
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author | Wang, Li Ni, Peiyong Xi, Guannan |
author_facet | Wang, Li Ni, Peiyong Xi, Guannan |
author_sort | Wang, Li |
collection | PubMed |
description | 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 | Online Article Text |
id | pubmed-7994558 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-79945582021-03-29 The effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube Wang, Li Ni, Peiyong Xi, Guannan Sci Rep Article 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. Nature Publishing Group UK 2021-03-25 /pmc/articles/PMC7994558/ /pubmed/33767256 http://dx.doi.org/10.1038/s41598-021-86285-0 Text en © The Author(s) 2021 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Wang, Li Ni, Peiyong Xi, Guannan The effect of off-center placement of twisted tape on flow and heat transfer characteristics in a circular tube |
title | 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_short | 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 |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7994558/ https://www.ncbi.nlm.nih.gov/pubmed/33767256 http://dx.doi.org/10.1038/s41598-021-86285-0 |
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