Frictional drag reduction with air lubricant over a super-water-repellent surface |
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Authors: | Kazuhiro Fukuda Junichiro Tokunaga Takashi Nobunaga Tatsuo Nakatani Toru Iwasaki Yoshikuni Kunitake |
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Institution: | (1) Research and Development Headquarters, Mitsui Engineering and Shipbuilding Co., Ltd., 5-6-4 Tsukiji, Chuo-ku, Tokyo 104-8439, Japan, JP |
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Abstract: | This paper presents a new technique for reducing frictional drag using a super-water-repellent surface and air-injection
(called an SWR & A technique). Its effectiveness was examined by carrying out pressure-loss measurements with a tube of rectangular
cross section, along with resistance tests on a horizontal flat plate, a 7.2-m-long tanker model, and a 12-m-long high length-to-beam-ratio
model ship. These test results showed that the new technique can significantly reduce the models' frictional drag; for example,
the frictional resistance on the SWR surface was reduced by 80% at a speed of 4 m/s and 55% at 8 m/s.
Received: October 16, 2000 / Accepted: December 4, 2000 |
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Keywords: | Frictional drag reduction Air lubricant Super-water-repellent surface Fluid frictional drag |
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