Effect of elastic walls on suspension flow
Effect of elastic walls on suspension flow
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弹性壁对悬浮液流动的影响
DOI：
10.1103/physrevfluids.4.062301
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发表时间：
2019
影响因子：
2.7
通讯作者：
L. Brandt
中科院分区：
文献类型：
--
作者：
M. Rosti;M. Ardekani;L. Brandt
本文研究了具有可变形弹性壁面的平面Couette流中刚性颗粒的悬浮问题。我们发现，在极限的惯性消失，弹性壁诱导剪切稀化的悬浮液流，使有效粘度降低壁变形能力的增加。这种剪切变稀行为源于刚性颗粒、软壁和载液之间的相互作用;不对称壁变形引起作用于颗粒的净升力，因此颗粒朝向通道的主体迁移。根据我们的观察，我们提供了一个封闭的悬浮液粘度，可用于模拟弹性通道中的任意体积分数的悬浮液的流变学。
We study suspensions of rigid particles in a plane Couette flow with deformable elastic walls. We find that, in the limit of vanishing inertia, the elastic walls induce shear thinning of the suspension flow such that the effective viscosity decreases as the wall deformability increases. This shear-thinning behavior originates from the interactions between rigid particles, soft wall and carrier fluid; an asymmetric wall deformation induces a net lift force acting on the particles which therefore migrate towards the bulk of the channel. Based on our observations, we provide a closure for the suspension viscosity which can be used to model the rheology of suspensions with arbitrary volume fraction in elastic channels.