Magnetic field effect on the sedimentation process of two non-magnetic particles inside a ferrofluid

Dong, Zhi-Qiang1,2,4; Li, Xiang1,2,4; Yamaguchi, Hiroshi3; Yu, Peng1,2,4

2024

10.1016/j.jmmm.2023.171501

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   影响因子和分区

0304-8853

1873-4766

The behaviours of non-magnetic particles inside a ferrofluid have a significant effect on the performance of ferrofluid-based biosensors, such as antibody detection. The present work numerically investigates the sedimentation process of two non-magnetic spherical particles inside a ferrofluid under a uniform external magnetic field. A three-dimensional lattice Boltzmann model coupled with the bounce-back schemes is employed to simulate the corresponding flows. The present work particularly focuses on the effects of the magnetic field orientation and intensity on the sedimentation behaviours. The results show that the two particles are accelerated in a vertical magnetic field due to the reduction of drag, but decelerated in the magnetic field with the orientation of 30 degrees <= theta <= 90 degrees. The inter-particle collision is encouraged by the attractive dipole force for 0 degrees <= theta <= 45 degrees, resulting in an earlier occurrence of the 'kissing' stage, but is suppressed by the repulsive dipole force for 60 degrees <= theta <= = 90 degrees, leading to a postponement or even the absence of the 'kissing' stage. Meanwhile, it is found that the time duration of the 'drafting' stage decreases with the increasing of the magnetic field intensity. When the magnetic field intensity is beyond a critical value, the two particles self-assemble into a 'dumbbell-like' structure and the 'tumbling' stage will disappear during the sedimentation process. The present work demonstrates that the sedimentation behaviour of non-magnetic particles immersed in a ferrofluid can be controlled by varying the orientation and intensity of the external magnetic field, which can provide a valuable technical guidance for the industrial applications of ferrofluids.

Sedimentation Fluid-structure interaction Lattice Boltzmann method Ferrofluid Non-magnetic particle

SCI ; EI

英语

第一 ; 通讯

Shenzhen Science and Technology Innovation Commission, China["JSGG20220831101400002","RCBS20221008093107026"] ; Department of Science and Technology of Guangdong Province, China[2023B1212060001] ; China Postdoctoral Science Foundation, China[2022TQ0138] ; National Natural Science Foundation of China (NSFC)["12302361","12172163","91852205"] ; Guangdong Basic and Applied Basic Research Foundation[2022A1515110174]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Condensed Matter

WOS:001116073700001

ELSEVIER

PHYSICS

2-s2.0-85183479023

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Guangdong Prov Key Lab Turbulence Res & Applicat, Shenzhen 518055, Peoples R China
3.Doshisha Univ, Energy Convers Res Ctr, Kyoto 6300321, Japan
4.Southern Univ Sci & Technol, Ctr Complex Flows & Soft Matter Res, Shenzhen 518055, Peoples R China

Dong, Zhi-Qiang,Li, Xiang,Yamaguchi, Hiroshi,et al. Magnetic field effect on the sedimentation process of two non-magnetic particles inside a ferrofluid[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,2024,589.

Dong, Zhi-Qiang,Li, Xiang,Yamaguchi, Hiroshi,&Yu, Peng.(2024).Magnetic field effect on the sedimentation process of two non-magnetic particles inside a ferrofluid.JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,589.

Dong, Zhi-Qiang,et al."Magnetic field effect on the sedimentation process of two non-magnetic particles inside a ferrofluid".JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 589(2024).