Abstract Four collision behaviors are observed for droplet pairs at a T-junction and phase diagrams are constructed by considering the arriving distance difference, the droplet length and the capillary number. Critical conditions for both coalescence and splitting are shown. The main coalescence regime is varied for asynchronous droplet pairs and the cause of the coalescence which occurs while two droplets are pulled apart is confirmed. Movements of the front caps of various droplet pairs are exhibited to show their different degrees of competitions to penetrate into the downstream channel and the advantage that favors coalescence is acquired by comparison.

中文翻译：

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存在到达距离差异的液滴对碰撞特性

摘要 观察到液滴对在T形接头处的四种碰撞行为，并考虑到达距离差、液滴长度和毛细管数构建了相图。显示了聚结和分裂的临界条件。异步液滴对的主要聚结机制是不同的，并且确认了当两个液滴被拉开时发生聚结的原因。不同液滴对前盖的运动表现出不同程度的竞争渗透到下游通道，通过比较获得有利于聚结的优势。