The breakup process of stretching liquid bridges between plates is crucial for liquid transfer in printing technology. In the present study, the liquid bridges stretched by two parallel flat plates were simulated by using many-body dissipative particle dynamics, in which the competition between slip velocity of contact lines and thinning velocity of liquid bridges was focused on, and it shows that this competition plays a key role in determining the breakup behaviors of liquid bridges and the liquid transfer ratio between the two plates. The influences of surface wettability, plate stretching velocity, and liquid Oh number on the breakup process were discussed. The simulated results show that both poorer surface wettability and larger stretching velocity help to increase slip velocity and enable the liquid bridge to slip off the surfaces. For the case with hydrophilic surface and small plate stretching velocity, thinning velocity dominates the breakup process and the pinch-off occurs approximately at the middle part of the liquid bridge. For cases with asymmetric surface wettability, the liquid transfer ratio depends only on the asymmetry of surface wettability for smaller plate stretching velocity and larger Oh number. However, this phenomenon no longer occurs if the stretching velocity is increasing, where slip of the contact line becomes important. The shift of minimal radius for liquid bridges with asymmetric stretching velocities is also investigated, and it was found that the shift moment is only related to the surface wettability, regardless of the plate stretching velocity. Moreover, it shows that the formation of satellite drops depends on the sequential order of the appearance of the liquid bridge slipping off the surface and the breakup of the filament. The present work provides some insight to better understand the rupture mechanism of stretching liquid bridges, and may help to improve printing technology.

中文翻译：

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具有对称和非对称表面润湿性的拉伸液桥的研究

延伸板之间的液桥的分解过程对于印刷技术中的液体转移至关重要。在本研究中，利用多体耗散粒子动力学对两个平行平板拉伸的液桥进行了模拟，研究了接触线滑移速度与液桥细化速度之间的竞争，结果表明竞争在确定液桥的断裂行为和两块板之间的液体转移比方面起着关键作用。讨论了表面润湿性，印版拉伸速度和液体Oh数对破碎过程的影响。模拟结果表明，较差的表面润湿性和较大的拉伸速度都有助于增加滑移速度，并使液桥从表面滑落。对于具有亲水性表面和较小的板拉伸速度的情况，稀化速度在破裂过程中占主导地位，并且夹断大约发生在液桥的中间部分。对于具有不对称表面润湿性的情况，对于较小的板拉伸速度和较大的Oh数，液体传输率仅取决于表面润湿性的不对称性。但是，如果拉伸速度增加，接触线的滑移变得很重要，则不再出现这种现象。还研究了具有不对称拉伸速度的液桥的最小半径位移，并且发现位移力矩仅与表面润湿性有关，而与板的拉伸速度无关。此外，它表明，卫星滴的形成取决于液桥从表面滑落和细丝破裂的顺序。本工作提供了一些见识，可以更好地理解拉伸液桥的断裂机理，并可能有助于改善印刷技术。