Wall slip regimes in jammed suspensions of soft microgels

Justin Péméja, Baudouin Géraud, Catherine Barentin, and Marie Le Merrer
Phys. Rev. Fluids 4, 033301 – Published 11 March 2019

Abstract

We characterize microfluidic flows of jammed suspensions of soft microgels (Carbopol) behaving as yield-stress fluids. We quantify the wall slip friction, i.e., the slip velocity V versus the tangential stress at the wall σw. We demonstrate a transition in slip regimes, from a nonlinear behavior (Vσw2) to a linear one, as the stress at the wall is increased, as expected from scaling arguments. Using fluorescent imaging to characterize the microgel size, we rationalize the two friction regimes for various samples by estimating viscous and elastic forces at the scale of the microgel particle. Only local arguments are thus necessary to predict wall slip friction, in contrast to other complex flow features such as fluidity or shear banding where bulk and surface properties appear to be strongly related.

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  • Received 9 April 2018

DOI:https://doi.org/10.1103/PhysRevFluids.4.033301

©2019 American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
Polymers & Soft MatterFluid Dynamics

Authors & Affiliations

Justin Péméja1, Baudouin Géraud1, Catherine Barentin1,2, and Marie Le Merrer1,*

  • 1Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, VILLEURBANNE, France
  • 2Institut Universitaire de France, France

  • *marie.le-merrer@univ-lyon1.fr

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Vol. 4, Iss. 3 — March 2019

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