Microscale rheology of a soft glassy material close to yielding

Using confocal microscopy, we study the flow of a model soft glassy material: a concentrated emulsion. We demonstrate the micro-macro link between in situ measured movements of droplets during the flow and the macroscopic rheological response of a concentrated emulsion, in the form of scaling relati...

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Bibliographic Details
Published in:Physical review letters 2012-04, Vol.108 (14), p.148301, Article 148301
Main Authors: Jop, Pierre, Mansard, Vincent, Chaudhuri, Pinaki, Bocquet, Lydéric, Colin, Annie
Format: Article
Language:English
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Summary:Using confocal microscopy, we study the flow of a model soft glassy material: a concentrated emulsion. We demonstrate the micro-macro link between in situ measured movements of droplets during the flow and the macroscopic rheological response of a concentrated emulsion, in the form of scaling relationships connecting the rheological "fluidity" with local standard deviation of the strain-rate tensor. Furthermore, we measure correlations between these local fluctuations, thereby extracting a correlation length which increases while approaching the yielding transition, in accordance with recent theoretical predictions.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.108.148301