title: Microscale rheology of a soft glassy material close to yielding.
abstract: 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.
authors.affiliation: Université Bordeaux 1, Rhodia Laboratoire du Futur, Unité mixte Rhodia-CNRS, Université Bordeaux I, UMR 5258, Bordeaux, France.
authors.forename: Pierre
authors.initials: P
authors.lastname: Jop
authors.forename: Vincent
authors.initials: V
authors.lastname: Mansard
authors.forename: Pinaki
authors.initials: P
authors.lastname: Chaudhuri
authors.forename: Lydéric
authors.initials: L
authors.lastname: Bocquet
authors.forename: Annie
authors.initials: A
authors.lastname: Colin