论文标题
弱粘合性悬浮液显示振荡的速率依赖性，但不稳定剪切流动
Weakly adhesive suspension shows rate-dependence in oscillatory but not steady shear flows
论文作者
论文摘要
我们报告了牛顿溶剂中非胶体颗粒悬浮液的流变学测量值，其固体体积分数为40％。在振荡性剪切（OS）流下发现异常的，频率依赖性的复合粘度，而在相同的剪切速率下，在稳定的剪切（SS）流动中发现了恒定的动态粘度。我们表明，这种矛盾是由OS和SS之间的基本微观结构差异引起的，该微观结构差异是由弱粒子室内力介导的。代理粒子悬浮液的离散元素模拟证实了这一假设，并揭示了与实验一致的粘附诱导的剪切变薄机制，其剪切稀疏机制仅在OS中，仅在OS中。
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.
