A cloud of rigid fibres sedimenting in a viscous fluid
A cloud of rigid fibres sedimenting in a viscous fluid
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粘性流体中沉积的刚性纤维云
DOI：
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发表时间：
2010
影响因子：
3.7
通讯作者：
Jason E. Butler
中科院分区：
文献类型：
--
作者：
Joontaek Park;B. Metzger;É. Guazzelli;Jason E. Butler
实验和数值模拟已经进行了调查的刚性纤维云的变形和破碎的重力下降通过粘性流体在惯性和界面张力的情况下。观察到的纤维云演变成一个环面，随后变得不稳定，并打破成二次液滴本身变形成环面在一个重复的级联。这种行为类似于球形粒子云，尽管纤维云的演变更快。模拟，它使用两个不同水平的近似的远场流体动力相互作用，捕捉云的演变，并表明，自运动和流体动力引起的波动之间的耦合是负责云的更快的解体时间。云的动力学由与各向异性粒子的自运动有关的单个参数控制。实验证实了这些发现。
Experiments and numerical simulations have been performed to investigate the deformation and break-up of a cloud of rigid fibres falling under gravity through a viscous fluid in the absence of inertia and interfacial tension. The cloud of fibres is observed to evolve into a torus that subsequently becomes unstable and breaks up into secondary droplets which themselves deform into tori in a repeating cascade. This behaviour is similar to that of clouds of spherical particles, though the evolution of the cloud of fibres occurs more rapidly. The simulations, which use two different levels of approximation of the far-field hydrodynamic interactions, capture the evolution of the cloud and demonstrate that the coupling between the self-motion and hydrodynamically induced fluctuations are responsible for the faster break-up time of the cloud. The dynamics of the cloud are controlled by a single parameter which is related to the self-motion of the anisotropic particles. The experiments confirm these findings.