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We study the emergence of discontinuous shear-thickening (DST) in cornstarch,by combining macroscopic rheometry with local Magnetic Resonance Imaging (MRI)measurements. We bring evidence that macroscopic DST is observed only when theflow separates into a low-density flowing and a high-density jammed region. Inthe shear-thickened steady state, the local rheology in the flowing region, isnot DST but, strikingly, is often shear-thinning. Our data thus show that thestress jump measured during DST, in cornstach, does not capture a secondary,high-viscosity branch of the local steady rheology, but results from theexistence of a shear jamming limit at volume fractions quite significantlybelow random close packing.

Macroscopic Discontinuous Shear Thickening vs Local Shear Jamming in Cornstarch