Yield-stress fluids foams: flow patterns and controlled production in T-junction and flow-focusing devices

Abstract : We study the formation of yield-stress fluid foams in millifluidic flow-focusing and T-junction devices. First, we provide a phase diagram for the unsteady operating regimes of bubble production when the gas pressure and the yield-stress fluid flow rate are imposed. Three regimes are identified: a co-flow of gas and yield-stress fluid, a transient production of bubble and a flow of yield-stress fluid only. Taking wall slip into account, we provide a model for the pressure at the onset of bubble formation. Then, we detail and compare two simple methods to ensure steady bubble production: regulation of the gas pressure or flow-rate. These techniques, which are easy to implement, thus open pathways for controlled production of dry yield-stress fluid foams as shown at the end of this article.
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Article dans une revue
Soft Matter, Royal Society of Chemistry, 2016, 12 (46), pp.9355 - 9363. 〈10.1039/c6sm02054b〉
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https://hal-enpc.archives-ouvertes.fr/hal-01691667
Contributeur : Florence Rouyer <>
Soumis le : mercredi 24 janvier 2018 - 11:20:52
Dernière modification le : jeudi 12 juillet 2018 - 12:22:04

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Benoit Laborie, Florence Rouyer, Dan Angelescu, Elise Lorenceau. Yield-stress fluids foams: flow patterns and controlled production in T-junction and flow-focusing devices. Soft Matter, Royal Society of Chemistry, 2016, 12 (46), pp.9355 - 9363. 〈10.1039/c6sm02054b〉. 〈hal-01691667〉

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