Viscoelastic levitation

Viscoelastic levitation
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粘弹性悬浮

DOI:
10.1017/jfm.2022.418
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发表时间:
2022
影响因子:
3.7
通讯作者:
Zenit, Roberto
Zenit, Roberto
中科院分区:
工程技术2区
文献类型:
--
作者:
Su, Yunxing;Castillo, Alfonso;Shun Pak, On;Zhu, Lailai;Zenit, Roberto

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粘弹性的影响已被证明是通过对称性破缺表现出来的。在这项调查中,我们展示了一个新的现象,从这个想法。我们观察到,当一个致密的球体在壁附近旋转时(旋转方向与壁的法线方向和重力方向一致),它会悬浮在离壁一定距离的地方。由于(球体和壁之间)差距中的剪切力大于球体开口侧中的剪切力,因此剪切引起的弹性应力是不对称的,导致平衡球体重量的净弹性垂直力。我们进行实验,理论模型和数值模拟的各种尺寸和密度的旋转球体中的博格型流体。在小德博拉数范围内,通过考虑弹性力与引力之比的无量纲组,结果被折叠成一个普遍的趋势。
The effects of viscoelasticity have been shown to manifest themselves via symmetry breaking. In this investigation, we show a novel phenomenon that arises from this idea. We observe that when a dense sphere is rotated near a wall (the rotation being aligned with the wall-normal direction and gravity), it levitates to a fixed distance away from the wall. Since the shear is larger in the gap (between the sphere and the wall) than in the open side of the sphere, the shear-induced elastic stresses are thus asymmetric, resulting in a net elastic vertical force that balances the weight of the sphere. We conduct experiments, theoretical models and numerical simulations for rotating spheres of various sizes and densities in a Boger-type fluid. In the small-Deborah-number range, the results are collapsed into a universal trend by considering a dimensionless group of the ratio of elastic to gravitational forces.
DOI: 10.1103/physreve.90.013010
发表时间: 2014-07
期刊: Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子: --
作者:
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