Abstract A visualized experimental system is designed and constructed to study the bubble behaviors on the micro-orifice in liquid layer. The test section is performed in a rectangular duct of 0.27 m × 0.006 m × 0.012 m, and the air is injected from an orifice with 0.49 mm in diameter. The gas flow rate is in the range of 0.3–60 ml/min, while the corresponding Reynolds number is ranged from 0.87 to 173.18. The effect of gas flow rate on bubble behaviors and bubble coalescence characteristics are investigated systematically. The results state that the bubble height, the radius of curvature at the apex and the bubble detachment volume show little variation with the gas flow rate when the gas flow rate is less than 24 ml/min. While the bubble contact line diameter increases firstly and then decreases. During the multi-bubble regimes stage, the detachment volume of both leading bubbles and trailing bubbles increase with the Weber number. The time interval between two adjacent bubbles or coalescence cycles is almost 0 when Weber number is above 18.27.

中文翻译：

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微型通道微孔板气泡形成过程的实验研究

摘要 设计并搭建了可视化实验系统来研究液层微孔口气泡行为。试验段在0.27m×0.006m×0.012m的矩形风管中进行，空气从直径0.49mm的孔口注入。气体流速范围为 0.3–60 ml/min，而相应的雷诺数范围为 0.87 到 173.18。系统地研究了气体流速对气泡行为和气泡聚结特性的影响。结果表明，当气体流速小于 24 ml/min 时，气泡高度、顶点曲率半径和气泡脱离体积随气体流速的变化很小。而气泡接触线直径则先增大后减小。在多泡沫制度阶段，前导气泡和尾随气泡的脱离体积都随着韦伯数的增加而增加。当韦伯数大于 18.27 时，两个相邻气泡或聚结循环之间的时间间隔几乎为 0。