Build up of yield stress fluids via chaotic emulsification

Stabilized dense emulsions display a rich phenomenology connecting microstructure and rheology. In this work we study how an emulsion with a finite yield stress can be built via large-scale stirring. By gradually increasing the volume fraction of the dispersed minority phase, under the constant acti...

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Bibliographic Details
Published in:arXiv.org 2021-11
Main Authors: Girotto, Ivan, Benzi, Roberto, Gianluca Di Staso, Scagliarini, Andrea, Schifano, Sebastiano Fabio, Toschi, Federico
Format: Article
Language:English
Subjects:
Droplets
Elastic properties
Emulsions
Fluid flow
Phenomenology
Polydispersity
Rheological properties
Rheology
Size distribution
Stirring
Yield strength
Yield stress
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Summary:Stabilized dense emulsions display a rich phenomenology connecting microstructure and rheology. In this work we study how an emulsion with a finite yield stress can be built via large-scale stirring. By gradually increasing the volume fraction of the dispersed minority phase, under the constant action of a stirring force, we are able to achieve volume fractions close to \(80\%\). Despite the fact that our system is highly concentrated and not yet turbulent we observe a droplet size distribution consistent with the \(-10/3\) scaling, often associated to inertial range droplets breakup. We report that the polydispersity of droplet sizes correlates with the dynamics of the emulsion formation process. Additionally we quantify the visco-elastic properties of the dense emulsion finally obtained and we demonstrate the presence of a finite yield stress. The approach reported can pave the way to a quantitative understanding of the complex interplay between the dynamics of mesoscale constituents and the large scale flow properties yield-stress fluids.
ISSN:2331-8422
DOI:10.48550/arxiv.2111.12453