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Liquid foams are assemblies of bubbles inside a continuous liquid phase. The liquid is mostly confined inside microchannels, called Plateau borders, found at the contact between three bubbles. These liquid channels are sustained by capillary forces at the liquid-gas interfaces, are not sensitive to the Plateau-Rayleigh instability, but are flexible and deformable.
When a foam is subjected to stresses the liquid inside the channels might reorganize. A specific setup was devoted to create one single liquid channel and to study its spatio-temporal dynamics to mechanical forcing.
This includes drop-injected, bubble-burst or forced oscillations experiments. We could show that the dynamics is driven by capillarity and this latter is strong enough to trigger inertial flows even at the sub-millimetric scale of the channels. Interesting flow geometries and features are observed.
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