超撥水面への空気供給による摩擦抵抗低減に関する研究 : 第2報,摩擦抵抗の低減メカニズムの考察(<小特集>異相界面における諸現象の物理)
2002 年 68 巻 671 号 p. 1864-1870
詳細
2002 年 68 巻 671 号 p. 1864-1870
Experiments were conducted to investigate the slit width effect on the frictional drag reduction using the Super water repellent surface (SWR) and air injection method. The results showed that the friction factor of slit width 2.0 mm was smaller than that of 0.5 mm at low Reynolds number. It was also observed that the stable plane air film was formed for slit width 2.0 mm. The drag reduction mechanism, considering fluid slip at the air/water interface, was also studied both numerically and theoretically. As a result, the drag reduction by the thin air film was maximally 95% at Re=24×104 was obtained.
