Investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfaces
This study investigates the impact of roughness elements on fluid flow and heat transfer characteristics in narrow rectangular channels. The results show that when the fluid flows over roughness elements, it induces vortices near the wall, disturbing the flow and heat transfer boundary layers. This...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-08-01
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| Series: | Case Studies in Thermal Engineering |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25006641 |
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| author | Xue Zhang Wenpei Feng Xiaolong Yang Hongxing Yu Jian Deng Sijia Du |
| author_facet | Xue Zhang Wenpei Feng Xiaolong Yang Hongxing Yu Jian Deng Sijia Du |
| author_sort | Xue Zhang |
| collection | DOAJ |
| description | This study investigates the impact of roughness elements on fluid flow and heat transfer characteristics in narrow rectangular channels. The results show that when the fluid flows over roughness elements, it induces vortices near the wall, disturbing the flow and heat transfer boundary layers. This enhances heat transfer while simultaneously increasing flow resistance. Among different roughness types, cylindrical roughness elements demonstrate a more substantial improvement in both heat transfer efficiency and friction factor compared to cubic elements. The Nusselt number is found to be non-monotonic related to the height of the roughness elements, while the friction factor increases with height. Additionally, larger roughness element diameters lead to higher Nusselt numbers and friction factors. Further analysis reveals that under conditions where the spacing and height remain unchanged, an increase in the roughness elements quantity results in a diminished enhancement of heat transfer. The base edge length of the roughness elements has a more significant impact on heat transfer capacity than the additional heated area, while the additional area primarily affects the flow resistance, causing the friction factor to increase with the number of roughness elements. |
| format | Article |
| id | doaj-art-9974b96e1c604bb9bba1b05987c406c3 |
| institution | OA Journals |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-9974b96e1c604bb9bba1b05987c406c32025-08-20T02:00:54ZengElsevierCase Studies in Thermal Engineering2214-157X2025-08-017210640410.1016/j.csite.2025.106404Investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfacesXue Zhang0Wenpei Feng1Xiaolong Yang2Hongxing Yu3Jian Deng4Sijia Du5Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, ChinaScience and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China; College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu, 610059, China; Corresponding author. Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China.College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu, 610059, ChinaScience and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, ChinaScience and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, ChinaScience and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, ChinaThis study investigates the impact of roughness elements on fluid flow and heat transfer characteristics in narrow rectangular channels. The results show that when the fluid flows over roughness elements, it induces vortices near the wall, disturbing the flow and heat transfer boundary layers. This enhances heat transfer while simultaneously increasing flow resistance. Among different roughness types, cylindrical roughness elements demonstrate a more substantial improvement in both heat transfer efficiency and friction factor compared to cubic elements. The Nusselt number is found to be non-monotonic related to the height of the roughness elements, while the friction factor increases with height. Additionally, larger roughness element diameters lead to higher Nusselt numbers and friction factors. Further analysis reveals that under conditions where the spacing and height remain unchanged, an increase in the roughness elements quantity results in a diminished enhancement of heat transfer. The base edge length of the roughness elements has a more significant impact on heat transfer capacity than the additional heated area, while the additional area primarily affects the flow resistance, causing the friction factor to increase with the number of roughness elements.http://www.sciencedirect.com/science/article/pii/S2214157X25006641 |
| spellingShingle | Xue Zhang Wenpei Feng Xiaolong Yang Hongxing Yu Jian Deng Sijia Du Investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfaces Case Studies in Thermal Engineering |
| title | Investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfaces |
| title_full | Investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfaces |
| title_fullStr | Investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfaces |
| title_full_unstemmed | Investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfaces |
| title_short | Investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfaces |
| title_sort | investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfaces |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X25006641 |
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