1993 年 13 巻 Supplement2 号 p. 9-12
It has been desired to measure a velocity field around bubbles and bubble shapes in a liquid flow in order to clarify flow characteristics of a gas-liquid two-phase flow. Thus, a velocity field around a bubble flowing in water and the bubble shape were simultaneously measured. The bubbly flow was formed to pump air into water flowing upward in a rectangular duct ( 60×30 mm). Binary image correlation method based on high speed images between 1/200 sec was applied to measure the liquid velocity field around the bubble. The bubble shapes for the same high speed images were measured by a X-Y coordinator. The measured velocity field overlapped with the bubble shape are presented.