Abstract
We measured the reduction of turbulent frictional resistance by microbubbles injected in a two-dimensional water flow channel. We also measured the velocity as well as the turbulent intensity distributions in the boundary layer by LDV. The turbulent intensity was increased with the microbubbles at the buffer layer and the turbulent region. Whereas, the turbulent intensity was decreased with the microbubbles at the region very near to the wall. Further studies are necessary including the measurement of Reynolds stress.
