A ternary phase-field LB model was employed in this paper to study the collision between two immiscible liquid droplets in a continuous liquid medium. Five different cases were considered based on droplets’ density, viscosity, and interfacial tension ratio. The results were presented in the form of We-B. (Weber number, and collision parameter) nomograms. The hydrodynamics of the interaction was analyzed by visualizing droplets’ deformation and behavior during the impact, especially in the contact area. Three collision outcomes were identified for both partial and total spreading states: engulfment (I), bounce (II), and engulfment with encapsulation of a tiny bulk liquid drop (III). The highest probability of the latter was seen at We > 50 and B < 0.5 for the cases in which droplets had equal density and viscosity. It was found that the satellite droplet encapsulation in regime (III) occurs for the deformed droplets as a result of a concave interface at the moment of contact. This in turn leads to the formation of two contact points and liquid bridges. No satellite formation was observed for the case where the density ratio between the droplets was relatively high. Moreover, a drastic decrease (≈35%) in the boundary between regimes (II) and (I) was observed in this case, compared to the cases where the interacting droplets had equal density. Performed simulations for collisions near the transition point from partial to complete engulfment revealed that the hydrodynamics of interaction and the collision regimes are similar in both cases, despite the difference in the final morphology of the compound.

本文采用三元相场 LB 模型来研究连续液体介质中两个不混溶液滴之间的碰撞。根据液滴的密度、粘度和界面张力比考虑了五种不同的情况。结果以We-B的形式呈现。（韦伯数和碰撞参数）列线图。通过可视化液滴在撞击过程中的变形和行为，特别是在接触区域中，分析了相互作用的流体动力学。确定了部分和完全扩散状态的三种碰撞结果：吞没 (I)、弹跳 (II) 和包裹微小液体液滴 (III) 的吞没。对于液滴具有相同密度和粘度的情况，在 We > 50 和 B < 0.5 处看到后者的最高概率。发现由于在接触时刻凹面界面，变形液滴发生状态 (III) 中的卫星液滴封装。这反过来导致形成两个接触点和液桥。对于液滴之间的密度比相对较高的情况，没有观察到卫星形成。此外，与相互作用的液滴具有相同密度的情况相比，在这种情况下观察到状态 (II) 和 (I) 之间的边界急剧下降（≈35%）。对从部分吞没到完全吞没的过渡点附近的碰撞进行的模拟表明，尽管化合物的最终形态存在差异，但两种情况下的相互作用的流体动力学和碰撞方式是相似的。