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We experimentally investigated the role of boundary confinements in shearthickening suspensions. Unexpected rheological responses were observed acrossmultiple length scales under highly confined geometries. The flow curves werefound to equilibrate at very slow rates, and appeared S-shaped in steadystates. By combining shear rheological characterizations with boundary stressmicroscopy (BSM), we observed sustained local stress oscillations in confinedsuspensions. The stress heterogeneities were induced by concentratedhigh-stress clusters that traveled stably along the flow direction. We showthat the growth and relaxation of these particle clusters contributed to thenon-monotonic flow curves, and mitigated the fluctuations of global shear rate.By comparing the flow properties under different system sizes, we uncovered howboundary confinements effectively determined both the rheological andstatistical responses of dense suspensions to shear thickening transition.

S-shaped flow curves and local stress oscillations in confined shear thickening suspensions