沉降颗粒浆体的流变学
Rheology of sedimenting particle pastes
摘要：
我们研究了非布朗悬浮液在溶剂中的局部和全局流变学，该溶剂不是密度匹配的，导致颗粒的分层或沉降。局部和全球的测量表明，不完全的密度匹配导致出现一个临界剪切速率以上的悬浮液是均匀的流动，并低于沉降或分层发生。我们表明，临界剪切速率的值及其对实验参数的依赖性是由一个简单的竞争之间的粘性和引力，并提出了一个简单的缩放模型，同意从不同类型的实验（本地和全球）在不同的设置和系统的实验结果。
英文摘要：
We study the local and global rheology of non-Brownian suspensions in a solvent that is not density-matched, leading to either creaming or sedimentation of the particles. Both local and global measurements show that the incomplete density matching leads to the appearance of a critical shear rate above which the suspension is homogenized by the flow, and below which sedimentation or creaming happens. We show that the value of the critical shear rate and its dependence on the experimental parameters are governed by a simple competition between the viscous and gravitational forces, and present a simple scaling model that agrees with the experimental results from different types of experiments (local and global) in different setups and systems.
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