2020/06/08 by Zhouyang Ge, Raffaella Martone, Ge, Zhouyang +5
Chemical Engineering · Engineering · Materials Science · Mathematics · Physics and Astronomy · #Composite material #Granular flow and fluidized beds #Material Dynamics and Properties #Materials science #Mathematics #Mechanics #Newtonian fluid #Physics #Rheology #Rheology and Fluid Dynamics Studies #Shear (geology) #Shear flow #Shear rate #Shear thinning #Suspension (topology) #Thermodynamics #Viscosity #Volume fraction #cond-mat.soft #physics.flu-dyn
paper · pdf · doi:10.48550/arxiv.2006.04494
5 pages, 5 figures
arxiv created 2020/06/08 · openalex publication_date 2020/06/08 · arxiv updated 2020/06/09 · openalex created_date 2020/06/12 · openalex updated_date 2026/07/28
We report rheological measurements of a noncolloidal particle suspension in a Newtonian 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 rates in steady shear (SS) flow. We show that this contradiction arises from the underlying microstructural difference between OS and SS, mediated by weak interparticle forces. Discrete element simulations of proxy particle suspensions confirm this hypothesis and reveal an adhesion-induced, shear thinning mechanism with a -1/5 slope, only in OS, in agreement with experiments.