Abstract In this work an effort has been made to demonstrate and understand electrocoalescence phenomena in droplet-in-air system using an anchored drop setup. Phase diagrams pertaining to the behaviour of droplet-in-air system is absent in the existing literature, and hence, are constructed for three different droplet conductivities, low (1.5 μS/cm), moderate (1244 μS/cm), and high (89500 μS/cm). The critical electrocapillary number C a c (estimated to be ~ 0.25 ) for anchored droplets is found to be independent of droplet conductivity, cone angle, and separation distance between the droplets. For separation less than s 0 / R = 0.5 , coalescence is observed at all C a > C a c because the cone angle of contact is always less than the critical angle of contact for non-coalescence. Different mechanisms govern non-coalescence behaviour with change in droplet conductivity. In addition to coalescence and non-coalescence events, subsequent events after first non-coalescence are studied and an effort is made to explain and categorize the behaviour under different regimes.

中文翻译：

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空气中锚定水滴不聚结的实验研究

摘要在这项工作中，已经努力证明和理解使用锚定液滴设置的空气液滴系统中的电聚结现象。现有文献中不存在与空气中液滴系统行为相关的相图，因此，针对三种不同的液滴电导率构建了相图，低 (1.5 μS/cm)、中等 (1244 μS/cm) 和高 ( 89500 微秒/厘米）。发现锚定液滴的临界电毛细管数 C ac （估计为 ~ 0.25 ）与液滴电导率、锥角和液滴之间的分离距离无关。对于小于 s 0 / R = 0.5 的分离，在所有 C a > C ac 处观察到聚结，因为接触锥角总是小于非聚结的临界接触角。随着液滴电导率的变化，不同的机制控制着非聚结行为。除了聚结和非聚结事件之外，还研究了第一次非聚结之后的后续事件，并努力解释和分类不同制度下的行为。