ステレオ画像法を用いた気泡の壁近傍挙動の解析

抄録

The flow characteristic of bubbly flow is very complex because interactions between bubble and fluid,bubble and bubble,and bubble and wall appear simultaneously.In order to simplify the problem,one interaction is taken and studied experimentally.The study deals with the bubble-wall interaction as an elementary process of bubbly flow.The bouncing motion of a single bubble in water was measured by using stereo image processing.The bubble of about 4 mm diameter flowed up spirally and moved toward the wall.After touching the wall,the bubble bounced and moved toward the center of the channel.After that,the bubble turned to the wall again.The experimental results showed the deformation, orientation and velocity of the bubble during the bouncing process,which were not obtained in the previous study using 2D image processing.The aspect ratio and velocity of the bubble synchronized the bubble motion.The minor axis of the bubble was parallel to its moving direction,which was supposed as the effect of the drag force of the water.