4.5 Article

Inertial focusing and rotating characteristics of elliptical and rectangular particle pairs in channel flow

Journal

CHINESE PHYSICS B
Volume 31, Issue 8, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1674-1056/ac5983

Keywords

lattice Boltzmann method; particle trains self-organization; inertial migration; particle shape

Funding

  1. Major Program of the National Natural Science Foundation of China [12132015]
  2. Natural Science Foundation of Zhejiang Province, China [LQ22A020008]
  3. Key Research and Development Program of Zhejiang Province, China [2020C03081]

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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 types of particles form single-line and staggered particle trains, with axial spacing increasing with aspect ratio and Reynolds number. Perpendicular orientation angles are more pronounced in elliptical or rectangular particle pairs at larger aspect ratios and lower Reynolds numbers.
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.

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