AI 中文总结
本研究针对浓悬浮液的应变控制再悬浮，发现颗粒脱离临界应变与形状无关，而完全再悬浮临界应变受颗粒各向异性影响，建立了粘性再悬浮的统一应变框架。
AI 中文摘要
浓非布朗悬浮液展现出由流体动力学相互作用、颗粒微结构和重力共同调控的复杂再悬浮动力学。已知球形悬浮液中的粘性再悬浮是应变控制的，但其对各向异性颗粒的适用性尚不明确。本研究在稳态和振荡剪切条件下，探究了球形和棒状颗粒的浓悬浮液，结果揭示了两个应变控制的转变：颗粒从沉积床脱离，以及向完全悬浮状态的转变。两种形状颗粒的脱离临界应变均约为6，表明再悬浮起始在很大程度上不依赖颗粒形态；而完全再悬浮所需的临界应变，球形颗粒约为120，棒状颗粒约为180，体现出颗粒各向异性的显著影响。流体-应变标度关系可将不同颗粒浓度和形状的再悬浮起始数据整合，同时凸显颗粒形状对完全悬浮的不同影响。这些发现为粘性再悬浮建立了统一的基于应变的框架，并阐明了颗粒各向异性在浓悬浮液动力学中的作用。
英文摘要
> Dense non-Brownian suspensions exhibit complex resuspension dynamics governed by hydrodynamic interactions, particle microstructure, and gravity. While viscous resuspension in spherical suspensions is known to be strain-controlled, its applicability to anisotropic particles remains unclear. Here, we investigate dense suspensions of spherical and rod-shaped particles under steady and oscillatory shear. The results reveal two strain-controlled transitions: particle detachment from the sediment bed and the transition to a fully suspended state. Both particle shapes exhibit the same critical strain for detachment, approximately 6, indicating that resuspension onset is largely independent of particle morphology. In contrast, complete resuspension requires a critical strain of approximately 120 for spheres and 180 for rods, demonstrating a strong effect of particle anisotropy. A fluid-strain scaling collapses the onset of resuspension across particle concentrations and shapes while highlighting the distinct influence of particle shape on complete suspension. These findings establish a unified strain-based framework for viscous resuspension and clarify the role of particle anisotropy in dense suspension dynamics.
Comments12 pages, 10 Figures (This manuscript is in review in the Journal of Rheology)
