Inertial focusing and rotating characteristics of elliptical and rectangular particle pairs in channel flow
Pei-Feng Lin(林培锋)1, Xiao Hu(胡箫)1,2,†, and Jian-Zhong Lin(林建忠)2
1 Key Laboratory of Fluid Transmission Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China; 2 Department of Mechanics, State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
Abstract The lattice Boltzmann method is used to study the inertial focusing and rotating characteristics of two-dimensional elliptical particles and rectangular particles in channel flow. The results show that both elliptical particles and rectangular particles initially located on one side and two sides of channel centerline migrate first towards the equilibrium position. Then, the single-line particle train with an increasing spacing and the staggered particle train with stable spacing are formed. The axial spacing of the staggered particle pair increases with aspect ratio and Reynolds number increasing. The staggered elliptical or rectangular particle pairs form perpendicular orientation angles, which will be more obvious at larger aspect ratio and lower Reynolds number. The single-line particle trains with different shapes seldom form the perpendicular orientation angle.
Fund: Project supported by the Major Program of the National Natural Science Foundation of China (Grant No. 12132015), the Natural Science Foundation of Zhejiang Province, China (Grant No. LQ22A020008), and the Key Research and Development Program of Zhejiang Province, China (Grant No. 2020C03081).
Corresponding Authors:
Xiao Hu
E-mail: huxiao0329@163.com
Cite this article:
Pei-Feng Lin(林培锋), Xiao Hu(胡箫), and Jian-Zhong Lin(林建忠) Inertial focusing and rotating characteristics of elliptical and rectangular particle pairs in channel flow 2022 Chin. Phys. B 31 080501
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