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Universality of Jamming Criticality in Overdamped Shear-Driven Frictionless Disks
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
University of Rochester, Rochester NY 14627 USA.
2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, no 14, 148002- p.Article in journal (Refereed) Published
Abstract [en]

We investigate the criticality of the jamming transition for overdamped shear-driven frictionless disks in two dimensions for two different models of energy dissipation: (i) Durian’s bubble model with dissipation proportional to the velocity difference of particles in contact, and (ii) Durian’s “mean-field” approximation to (i), with dissipation due to the velocity difference between the particle and the average uniform shear flow velocity. By considering the finite-size behavior of pressure, the pressure analog of viscosity, and the macroscopic friction σ/p  , we argue that these two models share the same critical behavior.

Place, publisher, year, edition, pages
American Physical Society , 2014. Vol. 113, no 14, 148002- p.
Keyword [en]
jamming, universality, granular matter
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-84199DOI: 10.1103/PhysRevLett.113.148002ISI: 00034431200014OAI: oai:DiVA.org:umu-84199DiVA: diva2:680341
Available from: 2013-12-17 Created: 2013-12-17 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Jamming and Soft-Core Rheology
Open this publication in new window or tab >>Jamming and Soft-Core Rheology
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Many different physical systems, such as granular materials, colloids, foams and emulsions exhibit a jamming transition where the system changes from a liquid-like flowing state to a solid jammed state as the packing fraction increases. These systems are often modeled using soft-core particles with repulsive contact forces. In this thesis we explore several different dynamical models for these kinds of systems, and see how they affect the behavior around the jamming transition. We investigate the effect of different types of dissipative forces on the rheology, and study how different methods of preparing a particle configuration affect their probability to jam when quenched. We study the rheology of sheared systems close to the jamming transition. It has been proposed that the athermal jamming transition is controlled by a critical point, point J, with certain scaling properties. We investigate this using multivariable scaling analysis based on renormalization group theory to explore the scaling properties of the transition and determine the position of point J and some of the critical exponents.

Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2013. 56 p.
Keyword
jamming, rheology, soft matter, granular material, SLLOD, critical point, critical scaling
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:umu:diva-84200 (URN)978-91-7459-784-4 (ISBN)
Public defence
2014-01-17, KB3A9 (Lilla hörsalen), Umeå University KBC building, Umeå, 10:00 (English)
Opponent
Supervisors
Available from: 2013-12-19 Created: 2013-12-17 Last updated: 2013-12-19Bibliographically approved

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