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Numerical Analysis on Heat Transfer Characteristics of Supercritical CO(2) in Heated Vertical Up-Flow Tube
It is great significance to understand the mechanism of heat transfer deterioration of supercritical CO(2) for heat exchanger design and safe operation in the supercritical CO(2) Brayton cycle. Three-dimensional steady-state numerical simulation was performed to investigate the behavior of supercrit...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040844/ https://www.ncbi.nlm.nih.gov/pubmed/32033437 http://dx.doi.org/10.3390/ma13030723 |
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author | Yan, Chenshuai Xu, Jinliang Zhu, Bingguo Liu, Guanglin |
author_facet | Yan, Chenshuai Xu, Jinliang Zhu, Bingguo Liu, Guanglin |
author_sort | Yan, Chenshuai |
collection | PubMed |
description | It is great significance to understand the mechanism of heat transfer deterioration of supercritical CO(2) for heat exchanger design and safe operation in the supercritical CO(2) Brayton cycle. Three-dimensional steady-state numerical simulation was performed to investigate the behavior of supercritical CO(2) heat transfer in heated vertical up-flow tube with inner diameter d(i) = 10 mm and heated length L(h) = 2000 mm. Based on the characteristics of inverted-annular film boiling at subcritical pressure, the heat transfer model of supercritical CO(2) flowing in the heated vertical tube was established in this paper. The mechanisms of heat transfer deterioration (HTD) and heat transfer recovery (HTR) for supercritical CO(2) were discussed. Numerical results demonstrate that HTD is affected by multiple factors, such as the thickness and property of vapor-like film near the wall, the turbulence intensity near the interface between liquid-like and vapor-like, and in the liquid-like core region as well as the distribution of radial velocity vector. Among the above factors, the change of turbulent kinetic energy caused by the buoyancy effect seems to be a more important contributor to HTD and HTR. Furthermore, the influences of heat flux and mass flux on the distribution of wall temperature were analyzed, respectively. The reasons for the difference in wall temperature at different heat fluxes and mass fluxes were explained by capturing detailed thermal physical properties and turbulence fields. The present investigation can provide valuable information for the design optimization and safe operation of a supercritical CO(2) heat exchanger. |
format | Online Article Text |
id | pubmed-7040844 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-70408442020-03-09 Numerical Analysis on Heat Transfer Characteristics of Supercritical CO(2) in Heated Vertical Up-Flow Tube Yan, Chenshuai Xu, Jinliang Zhu, Bingguo Liu, Guanglin Materials (Basel) Article It is great significance to understand the mechanism of heat transfer deterioration of supercritical CO(2) for heat exchanger design and safe operation in the supercritical CO(2) Brayton cycle. Three-dimensional steady-state numerical simulation was performed to investigate the behavior of supercritical CO(2) heat transfer in heated vertical up-flow tube with inner diameter d(i) = 10 mm and heated length L(h) = 2000 mm. Based on the characteristics of inverted-annular film boiling at subcritical pressure, the heat transfer model of supercritical CO(2) flowing in the heated vertical tube was established in this paper. The mechanisms of heat transfer deterioration (HTD) and heat transfer recovery (HTR) for supercritical CO(2) were discussed. Numerical results demonstrate that HTD is affected by multiple factors, such as the thickness and property of vapor-like film near the wall, the turbulence intensity near the interface between liquid-like and vapor-like, and in the liquid-like core region as well as the distribution of radial velocity vector. Among the above factors, the change of turbulent kinetic energy caused by the buoyancy effect seems to be a more important contributor to HTD and HTR. Furthermore, the influences of heat flux and mass flux on the distribution of wall temperature were analyzed, respectively. The reasons for the difference in wall temperature at different heat fluxes and mass fluxes were explained by capturing detailed thermal physical properties and turbulence fields. The present investigation can provide valuable information for the design optimization and safe operation of a supercritical CO(2) heat exchanger. MDPI 2020-02-05 /pmc/articles/PMC7040844/ /pubmed/32033437 http://dx.doi.org/10.3390/ma13030723 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Yan, Chenshuai Xu, Jinliang Zhu, Bingguo Liu, Guanglin Numerical Analysis on Heat Transfer Characteristics of Supercritical CO(2) in Heated Vertical Up-Flow Tube |
title | Numerical Analysis on Heat Transfer Characteristics of Supercritical CO(2) in Heated Vertical Up-Flow Tube |
title_full | Numerical Analysis on Heat Transfer Characteristics of Supercritical CO(2) in Heated Vertical Up-Flow Tube |
title_fullStr | Numerical Analysis on Heat Transfer Characteristics of Supercritical CO(2) in Heated Vertical Up-Flow Tube |
title_full_unstemmed | Numerical Analysis on Heat Transfer Characteristics of Supercritical CO(2) in Heated Vertical Up-Flow Tube |
title_short | Numerical Analysis on Heat Transfer Characteristics of Supercritical CO(2) in Heated Vertical Up-Flow Tube |
title_sort | numerical analysis on heat transfer characteristics of supercritical co(2) in heated vertical up-flow tube |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040844/ https://www.ncbi.nlm.nih.gov/pubmed/32033437 http://dx.doi.org/10.3390/ma13030723 |
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