Single air bubble rising near vertical wall in a Hele–Shaw cell was investigated experimentally. Bubbles with a large range of size from 4.46 mm to 21.68 mm were generated. A vertical wall was introduced in the cell, and the initial distance between the wall and the bubble releasing position was varied systematically to study the wall effect on the rising dynamics. Rising trajectory, bubble morphology, and rising characteristics were analyzed. Bubble will migrates away from the wall, and the trajectory transits from rectilinear path to zigzag. Two mechanisms of zigzag were revealed as “rigid zigzag” for the small bubble and “contracting zigzag” for the large bubble. It is always easier to zigzag for a more rounded bubble, and migration is always stronger with a smaller normalized initial distance.

中文翻译：

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Hele-Shaw 池中单个气泡上升的壁效应

通过实验研究了 Hele-Shaw 池中垂直壁附近上升的单个气泡。产生的气泡尺寸范围较大，从 4.46 毫米到 21.68 毫米。在池中引入垂直壁，系统地改变壁与气泡释放位置之间的初始距离，以研究壁对上升动力学的影响。分析了上升轨迹、气泡形态和上升特征。气泡将远离墙壁迁移，轨迹从直线路径转变为之字形。锯齿形的两种机制被揭示为小气泡的“刚性锯齿形”和大气泡的“收缩锯齿形”。对于更圆的气泡来说，锯齿形总是更容易，并且标准化初始距离越小，迁移总是越强。