Large-scale Flow Structures of Drag-reducing Turbulent Boundary Layer due to Surfactant Injection
界面活性剤注入による抵抗低減乱流境界層の大規模流れ構造
- Delivery
- Available on this site
- Format
- Price
- Non-members (tax incl.)：￥1,100 Members (tax incl.)：￥880
- Publication code
- 20214796
- Paper/Info type
- Journal of Society of Automotive Engineers of Japan
Vol.75 No.11
- Pages
- 90-95(Total 6 p)
- Date of publication
- Nov 2021
- Publisher
- JSAE
- Language
- Japanese
Detailed Information
| Category(J) | ホットトピックス Translation |
|---|---|
| Category(E) | Hot Topics |
| Author(J) | 1) 玉野 真司 |
| Author(E) | 1) Shinji Tamano |
| Affiliation(J) | 1) 名古屋工業大学 |
| Abstract(J) | 水流に微小量の界面活性剤を添加すると乱流摩擦抵抗が著しく低減することが知られている．非イオン性の界面活性剤水溶液を乱流境界層流れに注入することで，抵抗低減率が大きい下流域において，流れ方向に引き伸ばされた大規模流れ構造が間欠的に生じることを広範囲PIV計測により明らかにした． Translation |
| Abstract(E) | A small amount of some kinds of surfactant additives could cause significant frictional drag reduction in wall-bounded turbulent flows. In this tutorial paper, we present recent large-region PIV measurements with four CCD cameras for turbulent boundary layer due to the injection of nonionic surfactant. Very large-scale coherent structures appear periodically in the case of large drag reduction ratio beyond 60%. Such structures expand to beyond twice of the boundary layer thickness in the streamwise direction, which are far from typical near-wall coherent structures of Newtonian fluids. |
