Frictional drag reduction by injecting bubbly water into turbulent boundary layer
Book
·
OSTI ID:100920
- Univ. of Tokyo (Japan). Dept. of Naval Architecture and Ocean Engineering
Microbubbles, when in the inner zone of a turbulent boundary layer, are known to reduce frictional resistance drastically. Employing a new experimental technique, premixed bubbly water was injected into the boundary layer through a slit on the wall. There are optimum combinations of air- and water-flow rates for maximum reduction in resistance. The local frictional resistance became as low as one fifth of the value without injection at the optimum flow rate. Experiments with microbubble injection through porous plates were also done and compared with bubbly-water injection. Effects of wall orientation and bubble size, as well as energy balance of the injection process were examined.
- OSTI ID:
- 100920
- Report Number(s):
- CONF-940659--; ISBN 0-7918-1373-8
- Country of Publication:
- United States
- Language:
- English
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