Study on the drag reduction mechanism of spheres with various hydrophobic types
In this paper, a 3D hydrophobic model was developed using User-Defined Functions to investigate the flow characteristics and drag reduction mechanism of spheres with various hydrophobic types. The results confirmed that for the fully hydrophobic spheres, the separation point was continuously shifted...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Académie des sciences
2022-04-01
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| Series: | Comptes Rendus. Mécanique |
| Subjects: | |
| Online Access: | https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.110/ |
| _version_ | 1797651464101822464 |
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| author | Liu, Ju Yu, Junwei Kong, Lingbing Guo, Yonghui Yu, Hang Yuan, Kuo |
| author_facet | Liu, Ju Yu, Junwei Kong, Lingbing Guo, Yonghui Yu, Hang Yuan, Kuo |
| author_sort | Liu, Ju |
| collection | DOAJ |
| description | In this paper, a 3D hydrophobic model was developed using User-Defined Functions to investigate the flow characteristics and drag reduction mechanism of spheres with various hydrophobic types. The results confirmed that for the fully hydrophobic spheres, the separation point was continuously shifted back and the separation angle was reduced from 57.6° to 29.5° when the dimensionless slip length was increased from 0.02 to 0.1. The length of the recirculation zone was reduced from 1.90D to 0.93D, which was 51% shorter. And the decreasing fluctuation energy made the vortex structure transformed from hairpin-shaped vortices to vortex-ring. In addition, the drag reduction of partial-hydrophobic spheres was closely related to the number and location of the sudden change interfaces. |
| first_indexed | 2024-03-11T16:15:03Z |
| format | Article |
| id | doaj.art-485682fe2d8f430ab1467874910fe384 |
| institution | Directory Open Access Journal |
| issn | 1873-7234 |
| language | English |
| last_indexed | 2024-03-11T16:15:03Z |
| publishDate | 2022-04-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Mécanique |
| spelling | doaj.art-485682fe2d8f430ab1467874910fe3842023-10-24T14:21:03ZengAcadémie des sciencesComptes Rendus. Mécanique1873-72342022-04-01350G117118910.5802/crmeca.11010.5802/crmeca.110Study on the drag reduction mechanism of spheres with various hydrophobic typesLiu, Ju0Yu, Junwei1Kong, Lingbing2Guo, Yonghui3Yu, Hang4Yuan, Kuo5College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, ChinaBeijing Institute of Aerospace Control Devices, Beijing 100094, China; College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, ChinaBeijing Institute of Aerospace Control Devices, Beijing 100094, ChinaCollege of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, ChinaYunnan Kunchuan Electronic Equipment Co., Ltd., Kunming Yunnan 650236, ChinaCollege of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, ChinaIn this paper, a 3D hydrophobic model was developed using User-Defined Functions to investigate the flow characteristics and drag reduction mechanism of spheres with various hydrophobic types. The results confirmed that for the fully hydrophobic spheres, the separation point was continuously shifted back and the separation angle was reduced from 57.6° to 29.5° when the dimensionless slip length was increased from 0.02 to 0.1. The length of the recirculation zone was reduced from 1.90D to 0.93D, which was 51% shorter. And the decreasing fluctuation energy made the vortex structure transformed from hairpin-shaped vortices to vortex-ring. In addition, the drag reduction of partial-hydrophobic spheres was closely related to the number and location of the sudden change interfaces.https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.110/Slip lengthSphereHydrophobicDrag reduction mechanismVortex structureSeparation pointSlip length |
| spellingShingle | Liu, Ju Yu, Junwei Kong, Lingbing Guo, Yonghui Yu, Hang Yuan, Kuo Study on the drag reduction mechanism of spheres with various hydrophobic types Comptes Rendus. Mécanique Slip length Sphere Hydrophobic Drag reduction mechanism Vortex structure Separation point Slip length |
| title | Study on the drag reduction mechanism of spheres with various hydrophobic types |
| title_full | Study on the drag reduction mechanism of spheres with various hydrophobic types |
| title_fullStr | Study on the drag reduction mechanism of spheres with various hydrophobic types |
| title_full_unstemmed | Study on the drag reduction mechanism of spheres with various hydrophobic types |
| title_short | Study on the drag reduction mechanism of spheres with various hydrophobic types |
| title_sort | study on the drag reduction mechanism of spheres with various hydrophobic types |
| topic | Slip length Sphere Hydrophobic Drag reduction mechanism Vortex structure Separation point Slip length |
| url | https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.110/ |
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