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Contributions théorique et expérimentale à l'étude du drainage d'une mousse aqueuse

Abstract : In this thesis manuscript, we report theoretical and experimental results on drainage of aqueous foams. Two experimental setups were built to study foam drainage, the first one based on conductivity measurements and the second one based on multiple light scattering. These two devices enabled us to highlight the effect of the physical chemistry on the drainage of foam, and thus to reconcile in a qualitative way the two existing models of foam drainage. This effect of physical chemistry corresponds to the important role played by the surface viscoelasticity parameters of the channels on the drainage. Moreover, the experimental results show that the bubble size also has an influence on the drainage regime. This result can be understood in terms of competition between the dissipation at the surface and the dissipation in the bulk. Measurements of the dynamical surface tension were also made with the pendant drop technique. We proved this way that the surface of the channels remains locally in thermodynamic equilibrium with the bulk. On the theoretical level, a new model for the drainage explicitly including the surface viscoelastic parameters and the bubble size is proposed. The dependence of the drainage with these parameters is qualitatively in agreement with the experimental results. Finally, the effect of the disorder has been studied by calculating the effective conductivity of periodic foams. The conclusion of this study is that the laws governing the local structure of a foam (Plateau's laws) naturally imply a uniform distribution and orientation of the channels in the foam.
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Contributor : Marc Durand <>
Submitted on : Monday, March 8, 2004 - 7:25:41 PM
Last modification on : Wednesday, September 16, 2020 - 4:32:00 PM
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Marc Durand. Contributions théorique et expérimentale à l'étude du drainage d'une mousse aqueuse. Dynamique des Fluides [physics.flu-dyn]. Université Paris Sud - Paris XI, 2002. Français. ⟨tel-00005253⟩

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