矩形微通道内液塞的压力驱动动力学：准静态和动态薄膜沉积状态之间转变的影响
Pressure-driven dynamics of liquid plugs in rectangular microchannels: influence of the transition between quasi-static and dynamic film deposition regimes
摘要：
本文从实验和理论上研究了单向和循环压力作用下矩形微通道内液塞的动力学行为。在这两种情况下，它表明，准静态和动态膜沉积之间的过渡后面的液体塞导致一个显着的加速度的插头，迅速导致其破裂。这种行为正确的渠道与尖角恢复从降维模型的基础上以前的理论和数值的发展。此外，它示出的周期性强迫的插头经历稳定的周期性振荡，如果它仍然在准静态膜沉积制度在第一个周期期间，而否则它周期性地加速和破裂。这两个政权之间的过渡发生在一个压力依赖的临界初始长度，其值可以从理论上预测。
英文摘要：
In this paper, we study experimentally and theoretically the dynamics of liquid plugs in rectangular microchannels for both unidirectional and cyclic pressure forcing. In both cases, it is shown that the transition between quasi-static and dynamic film deposition behind the liquid plug leads to a dramatic acceleration of the plug, rapidly leading to its rupture. This behaviour proper to channels with sharp corners is recovered from a reduced dimension model based on previous theoretical and numerical developments. In addition, it is shown for cyclic periodic forcing that the plug undergoes stable periodic oscillations if it remains in the quasi-static film deposition regime during the first cycle, while otherwise it accelerates cyclically and ruptures. The transition between these two regimes occurs at a pressure-dependent critical initial length, whose value can be predicted theoretically.
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