Field-controlling patterns of sheared ferrofluid droplets
Field-controlling patterns of sheared ferrofluid droplets
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DOI：
10.1063/5.0094415
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发表时间：
2022-06-01
影响因子：
4.6
通讯作者：
Matsunaga, Daiki
中科院分区：
文献类型：
--
作者：
Ishida, Shunichi;Yang, Yaochen;Matsunaga, Daiki
我们研究了悬浮在壁限剪切流中的铁磁流体液滴在受到外部磁场作用时如何组织。通过调节外部磁场的大小，我们发现，当磁场较弱时，铁磁流体液滴在流动方向上形成链状结构，而在强磁场中则形成晶体状图案。我们通过应用数值模拟和分析计算，提供了相图和这种链到晶体转变的关键条件。我们还研究了如何通过简单地改变磁场方向来控制铁磁流体液滴的组织模式。这项工作展示了场可控铁磁流体液滴作为可配置和可再加工的超材料的新方面。 (C) 2022 作者。
We investigate how ferrofluid droplets suspended in a wall-bounded shear flow can organize when subjected to an external magnetic field. By tuning the magnitude of the external magnetic field, we find that the ferrofluid droplets form chain-like structures in the flow direction when the magnetic field is weak, while forming a crystal-like pattern in a strong magnetic field. We provide the phase diagram and the critical conditions for this chain-to-crystal transition, by applying both numerical simulations and analytic calculations. We also examine how the organized patterns of the ferrofluid droplets can be controlled by simply changing the direction of the magnetic field. This work demonstrates new aspects of field-controllable ferrofluid droplets as a configurable and reprocessable metamaterial. (C) 2022 Author(s).