Field-controlling patterns of sheared ferrofluid droplets

Author:

Ishida Shunichi1ORCID,Yang Yaochen23ORCID,Meng Fanlong234ORCID,Matsunaga Daiki5ORCID

Affiliation:

1. Graduate School of Engineering, Kobe University, Kobe 6578501, Japan

2. CAS Key Laboratory for Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China

3. School of Physical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China

4. Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, Zhejiang 325000, China

5. Graduate School of Engineering Science, Osaka University, Toyonaka 5608531, Japan

Abstract

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.

Funder

Japan Society for the Promotion of Science

ACT-X

Precursory Research for Embryonic Science and Technology

Chinese Academy of Sciences Key Project

Foundation for Innovative Research Groups of the National Natural Science Foundation of China

Publisher

AIP Publishing

Subject

Condensed Matter Physics,Fluid Flow and Transfer Processes,Mechanics of Materials,Computational Mechanics,Mechanical Engineering

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