138 気泡-壁面衝突により誘起される気泡運動と液相運動(S34-4 複雑流体の流れとその応用(4),S34 複雑流体の流れとその応用)  [in Japanese] 138 The Motion of a Bubble and Liquid Induced by a Wall-Bubble Collision  [in Japanese]

Wall-bubble interaction is one of the most important subjects for a deep understanding of gas-liquid two-phase flows. This study focuses on the liquid motion at the wall-bubble collision as well as the bubble motion. The liquid motion induced by the collision was measured via PIV. The motion of the bubble was microscopically visualized via a high-speed video camera, in order to clarify the motion of the center of gravity and the surface shape deformation. As a result, it was confirmed that (1) the bubble was forced by the wall in the area of L_<ap>/D_<eq>≒0.5, (2) after the collision, the bubble velocity was reduced, and the shape of bubble come to spherical, (3) the vorticity plays important role for the bubble motion.