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We report rheological measurements of a noncolloidal particle suspension in aNewtonian solvent at 40% solid volume fraction. An anomalous,frequency-dependent complex viscosity is found under oscillatory shear (OS)flow, whereas a constant dynamic viscosity is found under the same shear ratesin steady shear (SS) flow. We show that this contradiction arises from theunderlying microstructural difference between OS and SS, mediated by weakinterparticle forces. Discrete element simulations of proxy particlesuspensions confirm this hypothesis and reveal an adhesion-induced, shearthinning mechanism with a -1/5 slope, only in OS, in agreement withexperiments.

Weakly adhesive suspension shows rate-dependence in oscillatory but not steady shear flows