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In this paper, we study experimentally and theoretically the dynamics ofliquid plugs in rectangular microchannels for both unidirectional and cyclicpressure forcing. In both cases, it is shown that the transition betweenquasi-static and dynamic film deposition behind the liquid plug leads to adramatic acceleration of the plug, rapidly leading to its rupture. Thisbehaviour proper to channels with sharp corners is recovered from a reduceddimension model based on previous theoretical and numerical developments. Inaddition, it is shown for cyclic periodic forcing that the plug undergoesstable periodic oscillations if it remains in the quasi-static film depositionregime during the first cycle, while otherwise it accelerates cyclically andruptures. The transition between these two regimes occurs at apressure-dependent critical initial length, whose value can be predictedtheoretically.

Pressure-driven dynamics of liquid plugs in rectangular microchannels:  influence of the transition between quasi-static and dynamic film deposition  regimes