Flow and heat transfer characteristics of a novel airfoil-based tube with dimples
The performance of a novel airfoil-based tube with dimples is numerically studied in the present work. The effect of Reynolds number Re, dimples number N, relative depth H/D, and cross-distribution angle α on flow and heat transfer characteristics are discussed for Re in the range between 7,753 and...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Polish Academy of Sciences
2022-07-01
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| Series: | Bulletin of the Polish Academy of Sciences: Technical Sciences |
| Subjects: | |
| Online Access: | https://journals.pan.pl/Content/123661/PDF/2997_BPASTS_2022_70_4.pdf |
| _version_ | 1797999836214067200 |
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| author | Houju Pei Meinan Liu Kaijie Yang Li Zhimao Chao Liu |
| author_facet | Houju Pei Meinan Liu Kaijie Yang Li Zhimao Chao Liu |
| author_sort | Houju Pei |
| collection | DOAJ |
| description | The performance of a novel airfoil-based tube with dimples is numerically studied in the present work. The effect of Reynolds number Re, dimples number N, relative depth H/D, and cross-distribution angle α on flow and heat transfer characteristics are discussed for Re in the range between 7,753 and 21,736. The velocity contour, temperature contour, and local streamlines are also presented to get an insight into the heat transfer enhancement mechanisms. The results show that both the velocity magnitude and flow direction change, and fluid dynamic vortexes are generated around the dimples, which intensify the flow mixing and interrupt the boundary layer, resulting in a better heat transfer performance accompanied by a certain pressure loss compared with the plain tube. The Nusselt number Nu of the airfoil-based tube increases with the increase of dimples number, relative depth, and Reynolds numbers, but the effect of cross-distribution angle can be ignored. Under geometric parameters considered, the airfoil-based tube with N = 6, H/D = 0.1, α = 0° and Re = 7,753 can obtain the largest average PEC value 1.23. Further, the empirical formulas for Nusselt number Nu and friction factor f are fitted in terms of dimple number N, relative depth H/D, and Reynolds number Re, respectively, with the errors within ± 5%. It is found that the airfoil-based tube with dimples has a good comprehensive performance. |
| first_indexed | 2024-04-11T11:11:04Z |
| format | Article |
| id | doaj.art-c06afd3ed2a7435792dcf723af362434 |
| institution | Directory Open Access Journal |
| issn | 2300-1917 |
| language | English |
| last_indexed | 2024-04-11T11:11:04Z |
| publishDate | 2022-07-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Bulletin of the Polish Academy of Sciences: Technical Sciences |
| spelling | doaj.art-c06afd3ed2a7435792dcf723af3624342022-12-22T04:27:33ZengPolish Academy of SciencesBulletin of the Polish Academy of Sciences: Technical Sciences2300-19172022-07-01704https://doi.org/10.24425/bpasts.2022.141984Flow and heat transfer characteristics of a novel airfoil-based tube with dimplesHouju Pei0https://orcid.org/0000-0003-4334-376XMeinan Liu1Kaijie Yang2Li Zhimao3Chao Liu4Shanghai Aircraft Design and Research Institute Environment Control and Oxygen System Department, ChinaCollege of Energy and Power Engineering, Jiangsu University of Science and Technology, ChinaKey Laboratory of Aircraft Environment Control and Life Support, MIIT, Nanjing University of Aeronautics and Astronautics, ChinaShanghai Aircraft Design and Research Institute Environment Control and Oxygen System Department, ChinaShanghai Aircraft Design and Research Institute Environment Control and Oxygen System Department, ChinaThe performance of a novel airfoil-based tube with dimples is numerically studied in the present work. The effect of Reynolds number Re, dimples number N, relative depth H/D, and cross-distribution angle α on flow and heat transfer characteristics are discussed for Re in the range between 7,753 and 21,736. The velocity contour, temperature contour, and local streamlines are also presented to get an insight into the heat transfer enhancement mechanisms. The results show that both the velocity magnitude and flow direction change, and fluid dynamic vortexes are generated around the dimples, which intensify the flow mixing and interrupt the boundary layer, resulting in a better heat transfer performance accompanied by a certain pressure loss compared with the plain tube. The Nusselt number Nu of the airfoil-based tube increases with the increase of dimples number, relative depth, and Reynolds numbers, but the effect of cross-distribution angle can be ignored. Under geometric parameters considered, the airfoil-based tube with N = 6, H/D = 0.1, α = 0° and Re = 7,753 can obtain the largest average PEC value 1.23. Further, the empirical formulas for Nusselt number Nu and friction factor f are fitted in terms of dimple number N, relative depth H/D, and Reynolds number Re, respectively, with the errors within ± 5%. It is found that the airfoil-based tube with dimples has a good comprehensive performance.https://journals.pan.pl/Content/123661/PDF/2997_BPASTS_2022_70_4.pdfheat transfer enhancementairfoil-based tubedimplecomprehensive performance |
| spellingShingle | Houju Pei Meinan Liu Kaijie Yang Li Zhimao Chao Liu Flow and heat transfer characteristics of a novel airfoil-based tube with dimples Bulletin of the Polish Academy of Sciences: Technical Sciences heat transfer enhancement airfoil-based tube dimple comprehensive performance |
| title | Flow and heat transfer characteristics of a novel airfoil-based tube with dimples |
| title_full | Flow and heat transfer characteristics of a novel airfoil-based tube with dimples |
| title_fullStr | Flow and heat transfer characteristics of a novel airfoil-based tube with dimples |
| title_full_unstemmed | Flow and heat transfer characteristics of a novel airfoil-based tube with dimples |
| title_short | Flow and heat transfer characteristics of a novel airfoil-based tube with dimples |
| title_sort | flow and heat transfer characteristics of a novel airfoil based tube with dimples |
| topic | heat transfer enhancement airfoil-based tube dimple comprehensive performance |
| url | https://journals.pan.pl/Content/123661/PDF/2997_BPASTS_2022_70_4.pdf |
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