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Capillary imbibition of aqueous foams by miscible and nonmiscible liquids

Abstract : When put in contact with a large liquid drop, dry foams wick owing to surface-tension-driven flows until reaching equilibrium. This work is devoted to the dynamics of this imbibition process. We both consider imbibition of wetting or non-wetting liquid, either by putting the dry foam into contact with the foaming solution that constitutes the foam or with organic oils. Indeed, with the appropriate choice of surfactants, oil spontaneously invades the liquid network of the foam without damaging it. Our experiments show an early-time dynamics in t 1/2 followed by a late-time dynamics in t 1/4. These features, which differ from theoretical works predicting a late-time t 1/3 dynamics, are rationalized considering the influence of the initial liquid fraction of the foam in the driving capillary force and the impact of gravity through the capillary-gravity equilibrium.
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Submitted on : Tuesday, January 26, 2016 - 10:48:40 AM
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Rémy Mensire, Keyvan Piroird, Elise Lorenceau. Capillary imbibition of aqueous foams by miscible and nonmiscible liquids. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2015, 92 (5), ⟨10.1103/PhysRevE.92.053014⟩. ⟨hal-01262037⟩



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