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Issue 45, 2017
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Viscous forces and bulk viscoelasticity near jamming

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Abstract

When weakly jammed packings of soft, viscous, non-Brownian spheres are probed mechanically, they respond with a complex admixture of elastic and viscous effects. While many of these effects are understood for specific, approximate models of the particles' interactions, there are a number of proposed force laws in the literature, especially for viscous interactions. We numerically measure the complex shear modulus G* of jammed packings for various viscous force laws that damp relative velocities between pairs of contacting particles or between a particle and the continuous fluid phase. We find a surprising sensitive dependence of G* on the viscous force law: the system may or may not display dynamic critical scaling, and the exponents describing how G* scales with frequency can change. We show that this sensitivity is closely linked to manner in which viscous damping couples to floppy-like, non-affine motion, which is prominent near jamming.

Graphical abstract: Viscous forces and bulk viscoelasticity near jamming

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Publication details

The article was received on 11 Aug 2017, accepted on 09 Oct 2017 and first published on 11 Oct 2017


Article type: Paper
DOI: 10.1039/C7SM01619K
Citation: Soft Matter, 2017,13, 8368-8378
  • Open access: Creative Commons BY license
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    Viscous forces and bulk viscoelasticity near jamming

    K. Baumgarten and B. P. Tighe, Soft Matter, 2017, 13, 8368
    DOI: 10.1039/C7SM01619K

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