Print Email Facebook Twitter Viscous forces and bulk viscoelasticity near jamming Title Viscous forces and bulk viscoelasticity near jamming Author Baumgarten, K. (TU Delft Engineering Thermodynamics) Tighe, B.P. (TU Delft Engineering Thermodynamics) Date 2017 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. To reference this document use: http://resolver.tudelft.nl/uuid:4c48ffba-f1ee-429f-9c8b-d73084d67ba1 DOI https://doi.org/10.1039/C7SM01619K ISSN 1744-683X Source Soft Matter, 13 (45), 8368-8378 Part of collection Institutional Repository Document type journal article Rights © 2017 K. Baumgarten, B.P. Tighe Files PDF c7sm01619k.pdf 3.41 MB Close viewer /islandora/object/uuid:4c48ffba-f1ee-429f-9c8b-d73084d67ba1/datastream/OBJ/view