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Dissipation and Rheology of Sheared Soft-Core Frictionless Disks Below Jamming
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. 112, no 20, 208303Article in journal (Refereed) Published
Abstract [en]

We use numerical simulations to investigate the effect that different models of energy dissipation have on the rheology of soft-core frictionless disks, below jamming in two dimensions. We find that it is not necessarily the mass of the particles that determines whether a system has Bagnoldian or Newtonian rheology, but rather the presence or absence of large connected clusters of particles. We demonstrate the key role that tangential dissipation plays in the formation of such clusters and in several models find a transition from Bagnoldian to Newtonian rheology as the packing fraction. is varied. For each model, we show that appropriately scaled rheology curves approach a well defined limit as the mass of the particles decreases and collisions become strongly inelastic.

Place, publisher, year, edition, pages
2014. Vol. 112, no 20, 208303
Keyword [en]
Granular matter, rheology, Bagnold
National Category
Condensed Matter Physics
URN: urn:nbn:se:umu:diva-84195DOI: 10.1103/PhysRevLett.112.208303ISI: 000339554800015OAI: diva2:680184
Available from: 2013-12-17 Created: 2013-12-17 Last updated: 2016-06-08Bibliographically 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.
jamming, rheology, soft matter, granular material, SLLOD, critical point, critical scaling
National Category
Condensed Matter Physics
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)
Available from: 2013-12-19 Created: 2013-12-17 Last updated: 2013-12-19Bibliographically approved

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