Micro-bubbles Reduce Drag
 
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Micro-bubbles Reduce Drag

      4/3/1999

Ishikawajima-Harima Engineering has assessed the effects of drag reduction by micro-bubble injection. Long ship models with flat bottoms were used in experiments. The local skin friction and the total drag of 8 m, 20 m, and 40 m long slender ship models were measured while injecting micro-bubbles from porous plate during towing. The micro-bubbles were observed by CCD camera. Drag reduction was obtained by injecting micro-bubbles in all experimental cases. A maximum drag reduction was about 60% in frictional drag on the part of the flat bottom covered by micro-bubbles. Reduction of local skin friction was evident as far as about 40 m downstream from the injection point, although the reduction decreased with distance.
Ishikawajima-Harima Engineering Review March 1999, Vol. 39 No. 2 pp. 89-93
More information: IHI


 


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