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Shear thickening is a widespread phenomenon in suspension flow that, despitesustained study, is still the subject of much debate. The longstanding viewthat shear thickening is due to hydrodynamic clusters has been challenged byrecent theory and simulations suggesting that contact forces dominate, not onlyin discontinuous, but also in continuous shear thickening. Here, we settle thisdispute using shear reversal experiments on micron-sized silica and latexcolloidal particles to measure directly the hydrodynamic and contact forcecontributions to shear thickening. We find that contact forces dominate evencontinuous shear thickening. Computer simulations show that these forces mostlikely arise from frictional interactions.

Hydrodynamic and contact contributions to shear thickening in colloidal suspensions