Pinching Dynamics and Multiple Droplet Generation in Partial Coalescence.
Pinching Dynamics and Multiple Droplet Generation in Partial Coalescence.
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DOI：
10.1103/physrevlett.131.104001
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发表时间：
2023-09
影响因子：
8.6
通讯作者：
Teng Dong;P. Angeli
中科院分区：
文献类型：
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作者：
Teng Dong;P. Angeli
当液滴与同相液滴合并时，在一定条件下会出现液柱，液柱被夹断，导致部分聚结。我们通过实验和数值模拟研究了这一过程，发现当高颈比超过1时，Rayleigth-Plateau不稳定性能够夹断圆柱。发现表面活性剂在中等浓度下使圆柱体变细并产生多个液滴。对于母滴的夹断和随后的部分聚结中的液体线的分裂，颈部变薄最初处于惯性（I）状态，然后转变为惯性粘性（IV）状态。在较大的表面活性剂浓度下可以看到中间状态，这加速了变薄并有利于产生多个液滴。
When a drop merges with its homophase, a liquid cylinder appears in certain conditions, which is pinched off leading to partial coalescence. We investigate the process experimentally and numerically, and find that the Rayleigth-Plateau instability is able to pinch off the cylinder when its height-to-neck ratio exceeds one. Surfactants are found to attenuate the cylinder and produce multiple droplets at moderate concentrations. For both the pinch-off of the mother drop and the subsequent breakup of the liquid threads in partial coalescence, the neck thinning is initially in the inertial (I) regime and then shifts to the inertial-viscous (IV) regime. An intermediate regime is seen at larger surfactant concentrations, which accelerates the thinning and favours the generation of multiple droplets.