Abo Bibliothek: Guest
Third Symposium on Turbulence and Shear Flow Phenomena
June, 25-27, 2003, International Center, Sendai, Japan

DOI: 10.1615/TSFP3

THE DEGREE AND THE MECHANISM OF SKIN FRICTION REDUCTION BY MICROBUBBLES

pages 953-958
DOI: 10.1615/TSFP3.1590
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ABSTRAKT

First the applicability of microbubbles to ships as a skin friction reduction device is reviewed on their efficiency and from the environmental viewpoint, based on some experimental results including full scale. The review result is mostly favorable, but it is commented that the skin friction reduction mechanism is still unclear. Then two results of the most recent research on the skin friction reduction mechanism are shown in detail. One is an experimental one, in which microbubble flow was optically measured and the reduction of the Reynolds stress by microbubbles was obtained. The other is a numerical one, in which bubble injection into a turbulent channel flow was simulated and skin friction reduction was obtained. Finally some discussions on the skin friction reduction mechanism are given.

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