Drag Reduction on Super Water Repellent Surface with Air Injection Method : 2nd Report, Drag Reduction Mechanism

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 als...

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Bibliographic Details
Published inTransactions of the Japan Society of Mechanical Engineers Series B Vol. 68; no. 671; pp. 1864 - 1870
Main Authors MATSUMURA, Kunihito, KAMINAGA, Fumito, SAITO, Hiroshi
Format Journal Article
LanguageJapanese
Published The Japan Society of Mechanical Engineers 25.07.2002
Subjects
Turbulence
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Summary: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.
ISSN:0387-5016
1884-8346
DOI:10.1299/kikaib.68.1864