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Issue 22, 2017
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Foamed emulsion drainage: flow and trapping of drops

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Abstract

Foamed emulsions are ubiquitous in our daily life but the ageing of such systems is still poorly understood. In this study we investigate foam drainage and measure the evolution of the gas, liquid and oil volume fractions inside the foam. We evidence three regimes of ageing. During an initial period of fast drainage, both bubbles and drops are very mobile. As the foam stabilises drainage proceeds leading to a gradual decrease of the liquid fraction and slowing down of drainage. Clusters of oil drops are less sheared, their dynamic viscosity increases and drainage slows down even further, until the drops become blocked. At this point the oil fraction starts to increase in the continuous phase. The foam ageing leads to an increase of the capillary pressure until the oil acts as an antifoaming agent and the foam collapses.

Graphical abstract: Foamed emulsion drainage: flow and trapping of drops

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Supplementary files

Article information


Submitted
13 Mar 2017
Accepted
16 May 2017
First published
19 May 2017

Soft Matter, 2017,13, 4132-4141
Article type
Paper

Foamed emulsion drainage: flow and trapping of drops

M. Schneider, Z. Zou, D. Langevin and A. Salonen, Soft Matter, 2017, 13, 4132
DOI: 10.1039/C7SM00506G

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