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Numerical investigation of particle separation in Y-shaped bifurcating microchannels
Particuology ( IF 3.5 ) Pub Date : 2020-11-10 , DOI: 10.1016/j.partic.2020.10.003
Mahya Meyari , Zeinab Salehi , Reza Zarghami , Mahdi Saeedipour

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.



中文翻译:

Y形分叉微通道中颗粒分离的数值研究

在这项研究中,当刚性球形颗粒与壁之间的间隙与通道半径和颗粒半径相比较小时,在Y形分叉中研究Zweifach-Fung效应。使用耦合到离散元素方法的解析计算流体动力学研究了单粒子系统和两粒子系统,以获得将进入每个子分支的初始定位粒子的二维图。在所有情况下,球体的路径选择取决于其二维位置远离父通道的分叉区域。增加流速比或减少雷诺数会增强单粒子系统中的Zweifach-Fung分叉效应。同样,在存在非接触粒子间相互作用的两粒子系统中,减小粒子间的距离会降低分叉效应,而更改雷诺数与单粒子系统中的影响相同。结果为优化分叉微通道中的流动特性以分离悬浮颗粒提供了见识。

更新日期:2020-11-12
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