Measurement of Stress Redistribution in Flowing Emulsions

Kenneth W. Desmond and Eric R. Weeks
Phys. Rev. Lett. 115, 098302 – Published 28 August 2015
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Abstract

We study how local rearrangements alter droplet stresses within flowing dense quasi-two-dimensional emulsions at area fractions ϕ0.88. Using microscopy, we measure droplet positions while simultaneously using their deformed shape to measure droplet stresses. We find that rearrangements alter nearby stresses in a quadrupolar pattern: stresses on neighboring droplets tend to either decrease or increase depending on location. The stress redistribution is more anisotropic with increasing ϕ. The spatial character of the stress redistribution influences where subsequent rearrangements occur. Our results provide direct quantitative support for rheological theories of dense amorphous materials that connect local rearrangements to changes in nearby stress.

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  • Received 31 May 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.098302

© 2015 American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft Matter

Authors & Affiliations

Kenneth W. Desmond and Eric R. Weeks

  • Department of Physics, Emory University, Atlanta, Georgia 30322, USA

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Issue

Vol. 115, Iss. 9 — 28 August 2015

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