Particle captured by a field-modulating vortex through dielectrophoresis force

doi:10.1088/1674-1056/ac248a

Abstract In microfluidic technology, dielectrophoresis (DEP) is commonly used to manipulate particles. In this work, the fluid-particle interactions in a microfluidic system are investigated numerically by a finite difference method (FDM) for electric field distribution and a lattice Boltzmann method (LBM) for the fluid flow. In this system, efficient particle manipulation may be realized by combining DEP and field-modulating vortex. The influence of the density ($\rho_{\rm p}$), radius ($r$), and initial position of the particle in the $y$ direction ($y_{\rm p0}$), and the slip velocity ($u_{0}$) on the particle manipulation are studied systematically. It is found that compared with the particle without action of DEP force, the particle subjected to a DEP force may be captured by the vortex over a wider range of parameters. In the $y$ direction, as $\rho_{\rm p}$ or $r $ increases, the particle can be captured more easily by the vortex since it is subjected to a stronger DEP force. When $u_{0}$ is low, particle is more likely to be captured due to the vortex-particle interaction. Furthermore, the flow field around the particle is analyzed to explore the underlying mechanism. The results obtained in the present study may provide theoretical support for engineering applications of field-controlled vortices to manipulate particles.

Keywords: field-modulating vortex dielectrophoresis fluid—particle interactions

Received: 02 July 2021
Revised: 18 August 2021
Accepted manuscript online: 08 September 2021

PACS:	47.57.jd	(Electrokinetic effects)
	47.61.-k	(Micro- and nano- scale flow phenomena)
	47.15.Rq	(Laminar flows in cavities, channels, ducts, and conduits)

Fund: Project supported by the National Natural Science Foundation of China (Granmt Nos. 11572139, 11872187, and 12072125).

Corresponding Authors: Bo Chen, Zerui Peng
E-mail: chbo76@hust.edu.cn;zeruipeng@hust.edu.cn

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Bing Yan(严兵), Bo Chen(陈波), Zerui Peng(彭泽瑞), and Yong-Liang Xiong(熊永亮) Particle captured by a field-modulating vortex through dielectrophoresis force 2022 Chin. Phys. B 31 034703

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Particle captured by a field-modulating vortex through dielectrophoresis force

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