探究液滴速度对二元同尺寸液滴在超疏水表面上正面碰撞的行为变化，以纯水滴为研究对象，用高速摄影机观察液滴的碰撞过程，并建立碰撞后融合或弹开临界条件的理论模型，能够预测液滴碰撞后融合与弹开的临界速度。研究结果表明，随着液滴速度的提高，液滴碰撞后合并的可能性增大；液滴尺寸越大，液滴碰撞后融合或弹开的临界速度越低；液滴碰撞变形过程中内部压强增大超过表面张力承受极限，液滴就会发生融合。所建立的理论方法与实验结果吻合的较好。提出的理论模型可用于预测液滴在一定速度下的行为变化，达到控制液滴碰撞行为的目的，可应用于液滴操控、液滴传感、微反应器等领域。

Exploring the effect of droplet velocity on the behavior of binary droplets of the same size colliding head-on on a superhydrophobic surface, pure water droplets were used as the research object. The collision process of droplets was observed with a high-speed camera, and a theoretical model of the critical conditions for coalescence or bouncing after collision was established. The model can predict the critical velocity for coalescence or bouncing after droplet collision. The results show that with the increase in droplet velocity, the probability of droplet coalescence after collision increases; the larger the droplet size, the lower the critical velocity for coalescence or bouncing after collision. During the deformation process of droplet collision, the internal pressure increases beyond the limit that surface tension can withstand, resulting in droplet coalescence. The theoretical method established matches the experimental results well. The proposed theoretical model can be used to predict the behavioral changes of droplets at a certain velocity, achieving the purpose of controlling droplet collision behavior, and can be applied to fields such as droplet manipulation, droplet sensing, and microreactors.

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