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Issue 46, 2016
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Yield-stress fluids foams: flow patterns and controlled production in T-junction and flow-focusing devices

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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.

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

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Publication details

The article was received on 08 Sep 2016, accepted on 02 Nov 2016 and first published on 03 Nov 2016


Article type: Paper
DOI: 10.1039/C6SM02054B
Citation: Soft Matter, 2016,12, 9355-9363
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    Yield-stress fluids foams: flow patterns and controlled production in T-junction and flow-focusing devices

    B. Laborie, F. Rouyer, D. E. Angelescu and E. Lorenceau, Soft Matter, 2016, 12, 9355
    DOI: 10.1039/C6SM02054B

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