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Article Dans Une Revue Langmuir Année : 2023

Coarsening of foams driven by concentration gradients of gases of different solubilities

Résumé

The evolution of a foam driven by the transfer of two gases of different solubilities across the soap films is studied. A bamboo foam, or a train of films, is used as a model system; it is made of a poorly soluble gas, and put into contact with a reservoir of a soluble gas at an initial time. The measurement of the time evolution of the volume of each bubble shows that the foam swells, as it progressively incorporates the soluble gas. The dynamics is modelled from the gas fluxes across each film. The continuous limit of this model at large number of bubbles is studied in details: it gives an effective nonlinear diffusion equation, which fits the data very well. The corresponding diffusion constant, given by the product of the permeability of the soluble gas and the initial size of the bubbles, is shown to be the key parameter governing the coarsening dynamics of the foam.
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Dates et versions

hal-04283846 , version 1 (14-11-2023)

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Benjamin Dollet. Coarsening of foams driven by concentration gradients of gases of different solubilities. Langmuir, 2023, 39, pp.16174-16181. ⟨10.1021/acs.langmuir.3c02533⟩. ⟨hal-04283846⟩

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