无摩擦非布朗悬浮液跨堵塞态的临界标度与软颗粒流变学
Critical scaling and soft granular rheology of frictionless non-Brownian suspensions across jamming
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中文总结 AI 辅助
通过三维模拟研究无摩擦非布朗可变形颗粒悬浮液跨堵塞转变的流变行为，开展临界标度分析证实剪切驱动堵塞为二阶临界现象，构建流态图谱并提出软颗粒流变标度关系，实现宽范围动力学与密度区间的数据塌缩与预测。
中文摘要 AI 辅助
我们开展三维计算机模拟，研究可变形非布朗无摩擦颗粒悬浮液跨堵塞转变的流变行为。模拟针对多分散球形颗粒，在恒定剪切速率与悬浮液密度（$\dotγ , ϕ$）条件下进行。我们在堵塞点$ϕ_c$附近的密度区间以及更宽的密度范围内对悬浮液进行探测。我们对近堵塞数据开展临界标度分析，证实剪切驱动堵塞属于二阶临界现象，需对剪切作用进行强修正。我们构建局部应变速率指数图谱以划分流态，并考察修正项对悬浮液流变行为的影响。此外，我们利用临界标度堵塞密度，在更宽密度范围内开展软颗粒流变标度分析，展现出优异的数据塌缩效果。软颗粒流变关系几乎能在全部动力学与密度区间内预测我们的实验数据。
英文摘要
We carry out 3D computer simulations to study suspension rheology across the jamming transition for deformable non-Brownian frictionless particles. The simulations are carried out at constant shear rates and suspension densities ($\dotγ , ϕ$), for polydisperse spherical particles. The suspension is probed at densities in the neighbourhood of the jamming point $ϕ_c$ , as well as across much wider density ranges. We carry out critical scaling analysis of our close-to-jamming data and confirm that shear-driven jamming is a second-order critical phenomenon requiring strong corrections on shear. We build maps of the local strain rate exponent to classify flow regimes and examine the effect of the corrections on the suspension rheology. Further, using the critical scaling jamming density, we carry out soft granular rheological scaling over the wider density range, demonstrating an excellent data collapse. The soft granular rheology relations are able to predict our data over almost the entire dynamical and density range.
发表机构
- Univ. Grenoble Alpes（格勒诺布尔阿尔卑斯大学）
- CNRS（法国国家科学研究中心）
- Grenoble INP（格勒诺布尔国立理工学院）
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