title: Hydrodynamic and Contact Contributions to Continuous Shear Thickening in Colloidal Suspensions.
abstract: Shear thickening is a widespread phenomenon in suspension flow that, despite sustained study, is still the subject of much debate. The longstanding view that shear thickening is due to hydrodynamic clusters has been challenged by recent theory and simulations suggesting that contact forces dominate, not only in discontinuous, but also in continuous shear thickening. Here, we settle this dispute using shear reversal experiments on micron-sized silica and latex particles to measure directly the hydrodynamic and contact force contributions to shear thickening. We find that contact forces dominate even continuous shear thickening. Computer simulations show that these forces most likely arise from frictional interactions.
authors.affiliation: Department of Physics, Cornell University, Ithaca, New York 14853, USA.
authors.forename: Neil Y C
authors.initials: NY
authors.lastname: Lin
authors.affiliation: SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom.
authors.forename: Ben M
authors.initials: BM
authors.lastname: Guy
authors.affiliation: SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom.
authors.forename: Michiel
authors.initials: M
authors.lastname: Hermes
authors.affiliation: School of Engineering, University of Edinburgh, Edinburgh EH9 3JL, United Kingdom.
authors.forename: Chris
authors.initials: C
authors.lastname: Ness
authors.affiliation: School of Engineering, University of Edinburgh, Edinburgh EH9 3JL, United Kingdom.
authors.forename: Jin
authors.initials: J
authors.lastname: Sun
authors.affiliation: SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom.
authors.forename: Wilson C K
authors.initials: WC
authors.lastname: Poon
authors.affiliation: Department of Physics, Cornell University, Ithaca, New York 14853, USA.
authors.forename: Itai
authors.initials: I
authors.lastname: Cohen