壁面乱流渦と干渉するマイクロバブルの立体濃度分布の可視化

抄録

A method of visualization for the flow containing microbubbles is presented. The aim of the visualization is to investigate how microbubbles stay inside a turbulent boundary layer of a vertical flat wall as main flow passes by horizontally. A color coded volumetric illumination using a computer-controlled liquid crystal screen projector successfully extract three dimensional distribution of microbubbles close to the wall. From the result, long survive of microbubbles within low-speed streak regions and intermittent bursting of microbubble clouds due to ejection events have been clearly visualized, which contribute to the first-principle understanding of microbubble drag reduction,