Numerical investigation of particle separation in Y-shaped bifurcating microchannels_中国颗粒学会

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Partic. vol. 56 pp. 142-151 (June 2021)
doi: 10.1016/j.partic.2020.10.003

Numerical investigation of particle separation in Y-shaped bifurcating microchannels

Mahya Meyaria, Zeinab Salehia, Reza Zarghamia,*, Mahdi Saeedipourb

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rzarghami@ut.ac.ir

Highlights

    • The Zweifach-Fung effect is studied in a Y-shaped bifurcation using resolved CFD-DEM. • Path selection of the rigid sphere(s) depends on both y- and z-positioning. • Decreasing the feed Reynolds number amplifies the Zweifach-Fung effect. • The Zweifach-Fung effect is enhanced by increasing the flow difference between branches. • Decreasing the particle-to-particle distance diminishes the Zweifach-Fung effect.

Abstract

In this study the Zweifach-Fung effect is investigated in a Y-shaped bifurcation when the clearance between the rigid spherical particle and the walls is small compared to both channel's and particle's radii. Single- and two-particle systems are studied using resolved computational fluid dynamics coupled to discrete element method to obtain a two-dimensional map of the initially positioned particles that would enter each child branch. In all cases, the path selection of the sphere depends on its two-dimensional positioning far from the bifurcation region in the parent channel. Increasing the flow rate ratio or decreasing the Reynolds number intensifies the Zweifach-Fung bifurcation effect in a single-particle system. Similarly, in two-particle systems where non-contact particle–particle interaction is present, decreasing the particle-to-particle distance reduces the bifurcation effect, while changing the Reynolds number has the same influence as in the single-particle systems. The results provide insight for optimizing the flow characteristics in bifurcating microchannels to separate the suspended particles.

Graphical abstract

Keywords

Zweifach-Fung effect; Bifurcation; CFD-DEM; MicrOfluidics; Particle separation