小尺寸矩形槽道内气泡生长及运动特性

Visulization Experiments on Bubble Behaviors in a Mini-Rectangular Channel

通过实验研究了液体流动条件下小尺寸矩形槽道底部由微孔注入的气泡生长及运动特性。结合RCD算法与形心提取算法,有效地跟踪了气泡生长及运动轨迹。实验结果表明:气泡的形成过程可分为生长和涌入两个阶段;随着气体流量的增大,后续小气泡的涌入加强,涌入持续时间更长,气泡形成时间增加,等待时间缩短;槽道中小气泡的堆积现象随气体流量的增大而愈加明显。

The formation and movement of bubbles emerging from a micro-hole into a mini-channel with cross liquid flow were investigated experimentally. The dynamic bubble behaviors were tracked by coupling the RCD method and centroid detection method. The experimental results showed that the bubble formation process went through two stages： growth stage and inrush stage. With increasing gas flow rate, the inrush of subsequently little bubbles was enhanced, resulting in longer inrush stage. The time for bubble formation was then extended while the waiting time till next bubble coming out was shortened. The accumulation of micro-bubbles at the corner of the channel was obviously observed under large gas flow rate.