Bubble dynamics is of significance for improving the performance of bubbling. However, few studies focused on the detailed characteristics of bubble formation at micron-sized multiple orifices. Herein, the dynamic behaviors of bubble growth at micron-sized double-orifice plates are visually investigated. The evolution of adjacent bubbles, coalescence frequency, and detachment diameter of the initial bubbles with orifice diameter and spacing, gas flow, and liquid properties are obtained. Based on the experimental data, three dimensionless parameters, Weber number (We), Reynolds number (Re), and Froude number (Fr), are introduced through dimensional analysis. A mathematical correlation between the Sauter mean diameter of bubbles and orifice diameter and spacing, gas velocity, and liquid viscosity and surface tension is established for the first time. The error between the calculated and experimental values is found to be within ± 15 %. The work provides guidance for the understanding and development of bubbling at micro orifices.

中文翻译：

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浸没式微米级双孔板气泡的聚结特性：实验和建模


气泡动力学对于提高 Bubbling 的性能具有重要意义。然而，很少有研究关注微米级多孔口气泡形成的详细特征。在本文中，目视研究了微米级双孔板气泡生长的动态行为。获得了相邻气泡的演变、聚结频率和初始气泡的分离直径与孔径和间距、气体流量和液体性质的关系。基于实验数据，通过量纲分析引入了韦伯数 （We）、雷诺数 （Re） 和 Froude 数 （Fr） 三个无量纲参数。首次建立了 Sauter 气泡平均直径与孔口直径和间距、气体速度、液体粘度和表面张力之间的数学相关性。计算值和实验值之间的误差在 ± 15 % 以内。这项工作为理解和发展微孔口的鼓泡提供了指导。