论文标题
受约束颗粒悬浮液中的非单调流变学和应力异质性
Non-monotonic Rheology and Stress Heterogeneity in confined Granular suspensions
论文作者
论文摘要
我们系统地研究了边界限制对密集颗粒悬浮液的剪切厚性流变学的影响。在高度狭窄的条件下，发现密集的悬浮液在稳态中表现出大小依赖性的，甚至很少报道的非单调（$ s $形）流动曲线。通过执行原位边界应力显微镜测量值，我们观察到了限制悬浮液中的流动异质性增强，在这些悬浮液中，浓缩的高压力结构域沿着剪切方向稳定地稳定地传播。通过将边界应力显微镜结果与宏观流动响应进行比较，我们揭示了在受限悬浮液中非单调流变学与应力异质性之间的联系。这些发现表明，通过施加不同的边界限制来控制悬架流变学的可能性。
We systematically investigated the impact of boundary confinement on the shear-thickening rheology of dense granular suspensions. Under highly confined conditions, dense suspensions were found to exhibit size-dependent or even rarely reported non-monotonic ($S$-shaped) flow curves in steady states. By performing in-situ boundary stress microscopy measurements, we observed enhanced flow heterogeneities in confined suspensions, where concentrated high-stress domains propagated stably either along or against the shear direction. By comparing the boundary stress microscopy results with macroscopic flow responses, we revealed the connection between non-monotonic rheology and stress heterogeneity in confined suspensions. These findings suggest the possibility of controlling suspension rheology by imposing different boundary confinements.
