Rheological similarities between dense self-propelled and sheared particulate systems,Soft Matter

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Rheological similarities between dense self-propelled and sheared particulate systems
Soft Matter ( IF 2.9 ) Pub Date : 2020-03-17 , DOI: 10.1039/d0sm00101e
Ruoyang Mo _{1,

2,

3,

4,

5} , Qinyi Liao _{1,

2,

3,

4,

5} , Ning Xu _{1,

2,

3,

4,

5}

Affiliation

Different from previous modeling of self-propelled particles, we develop a method to propel particles with a constant average velocity instead of a constant force. This constant propulsion velocity (CPV) approach is validated by its agreement with the conventional constant propulsion force (CPF) approach in the flowing regime. However, the CPV approach shows its advantage of accessing quasistatic flows of yield stress fluids with a vanishing propulsion velocity, while the CPF approach is usually unable to because of finite system size. Taking this advantage, we realize cyclic self-propulsion and study the evolution of the propulsion force with the propelled particle displacement, both in the quasistatic flow regime. By mapping the shear stress and shear rate to the propulsion force and propulsion velocity, we find similar rheological behaviors of self-propelled systems to sheared systems, including the yield force gap between the CPF and CPV approaches, propulsion force overshoot, reversible–irreversible transition under cyclic propulsion, and propulsion bands in plastic flows. These similarities suggest underlying connections between self-propulsion and shear, although they act on systems in different ways.

中文翻译：

致密自推进和剪切颗粒系统的流变相似性

与以前的自推式粒子建模不同，我们开发了一种以恒定的平均速度而不是恒定的力推动粒子的方法。这种恒定推进速度（CPV）方法通过与流动状态下的常规恒定推进力（CPF）方法相一致而得到验证。但是，CPV方法显示出其优势，即可以以消失的推进速度进入屈服应力流体的准静态流，而CPF方法通常由于系统规模有限而无法使用。利用这一优势，我们实现了循环自推进，并研究了在准静态流态下推进力随推进的颗粒位移的演变。通过将剪切应力和剪切速率映射到推进力和推进速度，我们发现自推进系统与剪切系统的流变行为相似，包括CPF和CPV方法之间的屈服力差距，推进力超调，循环推进下可逆-不可逆转变以及塑性流中的推进带。这些相似之处表明，尽管它们以不同的方式作用于系统，但它们之间存在潜在的联系。

更新日期：2020-04-24

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