Plasticity and fluctuations in quasi-two-dimensional hopper flow of emulsions

Details Plasticity and fluctuations in quasi-two-dimensional hopper flow of emulsions Plasticity and fluctuations in quasi-two-dimensional hopper flow of emulsions

2011-05-12

arxiv.org/abs/1105.3099v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We experimentally study the shear flow of oil-in-water emulsion droplets in a thin sample chamber with a hopper shape. In this thin chamber, the droplets are formed into quasi-2D pancakes, somewhat analogous to soft photoelastic disks. From the deformations of the droplet outlines, we observe large stress fluctuations, similar to what has been seen in granular flow through hoppers. We show a direct and local relationship between T1 events (where four droplets rearrange, exchanging neighbors) and the macroscopic stress fluctuations. A T1 event influences the stress up to 3 droplet diameters away.

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