Journal of Marine Science and Technology

, Volume 5, Issue 3, pp 123–130

Frictional drag reduction with air lubricant over a super-water-repellent surface

  • Kazuhiro Fukuda
  • Junichiro Tokunaga
  • Takashi Nobunaga
  • Tatsuo Nakatani
  • Toru Iwasaki
  • Yoshikuni Kunitake

DOI: 10.1007/s007730070009

Cite this article as:
Fukuda, K., Tokunaga, J., Nobunaga, T. et al. J Mar Sci Technol (2000) 5: 123. doi:10.1007/s007730070009

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.

Key words Frictional drag reduction Air lubricant Super-water-repellent surface Fluid frictional drag 

Copyright information

© The Society of Naval Architects of Japan 2000

Authors and Affiliations

  • Kazuhiro Fukuda
    • 1
  • Junichiro Tokunaga
    • 1
  • Takashi Nobunaga
    • 1
  • Tatsuo Nakatani
    • 1
  • Toru Iwasaki
    • 1
  • Yoshikuni Kunitake
    • 1
  1. 1.Research and Development Headquarters, Mitsui Engineering and Shipbuilding Co., Ltd., 5-6-4 Tsukiji, Chuo-ku, Tokyo 104-8439, JapanJP

Personalised recommendations