Abstract
Our purpose is to elucidate the relationship between the bubble motion (zigzag motion and shape oscillation) and its surrounding liquid motion (obtained from Stereo PIV). We examined a zigzagging ascent bubble of 2.9 mm in equivalent diameter. At first, the surrounding liquid motion of the bubble was obtained quantitatively via Stereo PIV. Second, tomographic measurement of Stereo PIV was carried out in order to obtain the 3-D structure of surrounding liquid motion. From the Stereo PIV results, the relationship between the bubble motion (zigzag motion and shape oscillation) and the surrounding liquid motion was discussed. From these results, at y-z plane, it was considered that the asymmetry of the shape oscillation resulted in the velocity difference between the right and left sides of the bubble. Therefore, the bubble changed its direction of the motion due to the liquid-phase velocity difference between the right and left sides of the bubble.
