The Impact of Riblet Walls on the Structure of Liquid–Solid Two-Phase Turbulent Flow: Streak Structures and Burst Events
This study employs Particle Image Velocimetry (PIV) technology to investigate the statistical properties and flow structures of the turbulent boundary layer over smooth walls and riblet walls with yaw angles of 0, ±30° in both clear water and liquid–solid two-phase flow fields. The results indicate...
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2025-07-01
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| Online Access: | https://www.mdpi.com/2076-3417/15/14/7977 |
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| author | Yuchen Zhao Jiao Sun Nan Jiang Jingyu Niu Jinghang Yang Haoyang Li Xiaolong Wang Pengda Yuan |
| author_facet | Yuchen Zhao Jiao Sun Nan Jiang Jingyu Niu Jinghang Yang Haoyang Li Xiaolong Wang Pengda Yuan |
| author_sort | Yuchen Zhao |
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| description | This study employs Particle Image Velocimetry (PIV) technology to investigate the statistical properties and flow structures of the turbulent boundary layer over smooth walls and riblet walls with yaw angles of 0, ±30° in both clear water and liquid–solid two-phase flow fields. The results indicate that, compared to the smooth wall, streamwise riblet walls and 30° divergent riblet walls can reduce the boundary layer thickness, wall friction force, comprehensive turbulence intensity, and Reynolds stress, with the divergent riblet wall being more effective. In contrast, convergent riblet walls have the opposite effect. The addition of particles leads to an increase in boundary layer thickness and a reduction in wall friction resistance, primarily by reducing turbulence fluctuations and Reynolds stress in the logarithmic region of the turbulent boundary layer. Moreover, the two types of drag-reduction riblet walls can decrease the energy content ratio of near-wall streak structures and suppress their motion in the spanwise direction. Their impact on burst events is mainly characterized by a reduction in the number of ejection events and their contribution to Reynolds shear stress. In comparison, convergent riblet walls have the complete opposite effect and also enhance the intensity of burst events. The addition of particles can fragment streak structures and suppress the intensity and number of burst events, acting similarly on drag-reduction riblet walls and further strengthening their drag reduction characteristics. |
| format | Article |
| id | doaj-art-adb94e50640c47f4ab3c724bc6ea65f6 |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj-art-adb94e50640c47f4ab3c724bc6ea65f62025-08-20T03:36:13ZengMDPI AGApplied Sciences2076-34172025-07-011514797710.3390/app15147977The Impact of Riblet Walls on the Structure of Liquid–Solid Two-Phase Turbulent Flow: Streak Structures and Burst EventsYuchen Zhao0Jiao Sun1Nan Jiang2Jingyu Niu3Jinghang Yang4Haoyang Li5Xiaolong Wang6Pengda Yuan7Department of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300401, ChinaDepartment of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300401, ChinaDepartment of Mechanics, Tianjin University, Tianjin 300350, ChinaDepartment of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300401, ChinaDepartment of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300401, ChinaDepartment of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300401, ChinaDepartment of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300401, ChinaDepartment of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300401, ChinaThis study employs Particle Image Velocimetry (PIV) technology to investigate the statistical properties and flow structures of the turbulent boundary layer over smooth walls and riblet walls with yaw angles of 0, ±30° in both clear water and liquid–solid two-phase flow fields. The results indicate that, compared to the smooth wall, streamwise riblet walls and 30° divergent riblet walls can reduce the boundary layer thickness, wall friction force, comprehensive turbulence intensity, and Reynolds stress, with the divergent riblet wall being more effective. In contrast, convergent riblet walls have the opposite effect. The addition of particles leads to an increase in boundary layer thickness and a reduction in wall friction resistance, primarily by reducing turbulence fluctuations and Reynolds stress in the logarithmic region of the turbulent boundary layer. Moreover, the two types of drag-reduction riblet walls can decrease the energy content ratio of near-wall streak structures and suppress their motion in the spanwise direction. Their impact on burst events is mainly characterized by a reduction in the number of ejection events and their contribution to Reynolds shear stress. In comparison, convergent riblet walls have the complete opposite effect and also enhance the intensity of burst events. The addition of particles can fragment streak structures and suppress the intensity and number of burst events, acting similarly on drag-reduction riblet walls and further strengthening their drag reduction characteristics.https://www.mdpi.com/2076-3417/15/14/7977convergent and divergent riblet walltwo-phase flowparticle image velocimetryturbulent boundary layerstreak structuresburst events |
| spellingShingle | Yuchen Zhao Jiao Sun Nan Jiang Jingyu Niu Jinghang Yang Haoyang Li Xiaolong Wang Pengda Yuan The Impact of Riblet Walls on the Structure of Liquid–Solid Two-Phase Turbulent Flow: Streak Structures and Burst Events Applied Sciences convergent and divergent riblet wall two-phase flow particle image velocimetry turbulent boundary layer streak structures burst events |
| title | The Impact of Riblet Walls on the Structure of Liquid–Solid Two-Phase Turbulent Flow: Streak Structures and Burst Events |
| title_full | The Impact of Riblet Walls on the Structure of Liquid–Solid Two-Phase Turbulent Flow: Streak Structures and Burst Events |
| title_fullStr | The Impact of Riblet Walls on the Structure of Liquid–Solid Two-Phase Turbulent Flow: Streak Structures and Burst Events |
| title_full_unstemmed | The Impact of Riblet Walls on the Structure of Liquid–Solid Two-Phase Turbulent Flow: Streak Structures and Burst Events |
| title_short | The Impact of Riblet Walls on the Structure of Liquid–Solid Two-Phase Turbulent Flow: Streak Structures and Burst Events |
| title_sort | impact of riblet walls on the structure of liquid solid two phase turbulent flow streak structures and burst events |
| topic | convergent and divergent riblet wall two-phase flow particle image velocimetry turbulent boundary layer streak structures burst events |
| url | https://www.mdpi.com/2076-3417/15/14/7977 |
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