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

•A simple model can predict the behaviour of liquid plugs in rectangular channels.•The presence of sharp corners changes the liquid film deposition regime.•Liquid plugs dynamics in rectangular and cylindrical tubes is different.•Stable periodic oscillations of liquid plugs are observed in rectangular channels.•Cyclic rupture is always observed below a critical pressure-dependent plug length.