抄録
The behavior of a single bubble rising near a plate orifice placed in a vertical pipe is studied. The effect of the surface wettability of the orifice hole on the behavior of the bubble is examined in detail. A change in the bubble shape near the orifice is observed with a high-speed camera and the bubble rising velocity is determined from the images recorded on a PC. A single bubble tends to preferably attach to the orifice hole with an increase in its volume and stays there under specific conditions regardless of the wettability of the orifice. Two different prediction methods are proposed for the conditions.
