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research-article

The mechanism of size-based particle separation by dielectrophoresis in the viscoelastic flows

[+] Author and Article Information
Teng Zhou

Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan Province 570228, China
zhouteng@hainu.edu.cn

Yongbo Deng

Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Sciences, Changchun, Jilin 130033, China
dengyb@ciomp.ac.cn

Hongwei Zhao

Department of Environmental Science, Hainan University, Haikou, Hainan Province 570228, China
hwzhao@hainu.edu.cn

Xianman Zhang

Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan Province 570228, China
xianman213@163.com

Liuyong Shi

Mechanical and Electrical Engineering College, Hainan University, Haikou, Hainan Province 570228, China
liuyong_shi@163.com

Sang Woo Joo

School of Mechanical Engineering, Yeungnam University, Gyongsan 712-719, South Korea
swjoo@yu.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4039709 History: Received October 11, 2017; Revised March 07, 2018

Abstract

Viscoelastic solution is encountered extensively in microfluidics. In this work, the particle movement of the viscoelastic flow in the contraction-expansion channel is demonstrated. The fluid is described by the Oldroyd-B model, and the particle is driven by dielectrophoretic (DEP) forces induced by the applied electric field. A time dependent multiphysics numerical model with the thin electric double layer (EDL) assumption was developed, in which the Oldroyd-B viscoelastic fluid flow field, the electric field and the movement of finite-size particles are solved simultaneously by an Arbitrary Lagrangian-Eulerian (ALE) numerical method. By the numerically validated ALE method, the trajectories of particle with different sizes were obtained for the fluid with the Weissenberg number (Wi) of 1 and 0, which can be regarded as the Newtonian fluid. The trajectory in the Oldroyd-B flow with Wi=1 is compared with that in the Newtonian fluid. Also, trajectories for different particles with different particle sizes moving in the flow with Wi=1 are compared, which proves that the contraction-expansion channel can also be used for particle separation in the viscoelastic flow. The above results for this work provide the physical insight into the particle movement in the flow of viscous and elastic features.

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