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Theses

Couplages expérimentaux des propriétés interfaciales
et volumiques des mousses aqueuses : les cas de
l'imbibition en micropesanteur et de la rhéologie

Abstract : This thesis sheds light on two problems in 3D aqueous foams physics : fluid transport by capillary imbibition and rheology. A multiscale physicochemical approach is chosen, bulk measurements being linked to measurements at the gas / liquids interfaces. To do so, different surfactants and gas have been used, in order to control interfacial properties. On top of these parameters, the effect of the liquid volume fraction has been studied.
Some capillary imbibition characteristics have been measured by optical and electrical techniques during parabolic flights, allowing the suppression of gravitational drainage. Theoretical equations correctly describe the experimental results below a liquid volume fraction of 0,12. Above this limit, I have derived a new equation taking into account another distribution of liquid within the foam. Technical results from ESA / CNES programmes phases are also reported.
Rheology has been measured in both oscillatory and continuous modes. The first mode allows to originate the aqueous foams viscoelasticity from the Laplace pressure, with a possible correction by the film thickness. Moreover, I have developed a model based on the analogy between the liquid volume fraction and a temperature. The second mode, together with DWS (Diffusing-Wave Spectroscopy), allows to link macroscopic flow to microscopic rearrangements, while taking wall slip into account. Dilatancy phenomena have been evidenced for the first time in foams. Those lead to liquid phase flows which seem to be controlled, at first glance, by the same parameters than drainage flows.
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https://tel.archives-ouvertes.fr/tel-00122059
Contributor : Sebastien Marze <>
Submitted on : Sunday, December 24, 2006 - 12:23:36 PM
Last modification on : Friday, October 23, 2020 - 4:54:42 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 8:12:15 PM

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  • HAL Id : tel-00122059, version 1

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Sebastien Marze. Couplages expérimentaux des propriétés interfaciales
et volumiques des mousses aqueuses : les cas de
l'imbibition en micropesanteur et de la rhéologie. Dynamique des Fluides [physics.flu-dyn]. Université Paris Sud - Paris XI, 2006. Français. ⟨tel-00122059⟩

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