Inertial migration of aerosol particles in three-dimensional microfluidic channels--颗粒学报PARTICUOLOGY

Qian, S., Jiang, M., & Liu, Z. (2021). Inertial migration of aerosol particles in three-dimensional microfluidic channels. Particuology, 55, 23-34. https://doi.org/10.1016/j.partic.2020.08.001

Inertial migration of aerosol particles in three-dimensional microfluidic channels

Shizhi Qian ^{a 1 *}, Maoqiang Jiang ^{b c 1}, Zhaohui Liu ^b *

a Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA
b State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
c Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca NY 14853, USA

10.1016/j.partic.2020.08.001

Volume 55, April 2021, Pages 23-34

Received 24 June 2020, Revised 19 July 2020, Accepted 4 August 2020, Available online 18 August 2020, Version of Record 3 February 2021.

E-mail: sqian@odu.edu; zliu@hust.edu.cn

Highlights

• Inertial migration of aerosol particles in a 3D straight microchannel was simulated.

• Forces acting on the particle in the air–particle system are analyzed.

• Two unstable and four stable equilibrium positions in the air–particle system.

• High Reynolds number causes particle oscillation near equilibrium position.

Abstract

In recent years, manipulation of particles by inertial microfluidics has attracted significant attention. However, most studies focused on inertial focusing of particles suspended within liquid phase, in which the ratio of the density of the particle to that of the medium is O(1). The investigation on manipulation of aerosol particles in an inertial microfluidics is very limited. In this study, we numerically investigate the aerosol particle's motion in a 3D straight microchannel with rectangular cross section by fully resolved simulation of the particle–air flow. The air flow is modeled by the Navier–Stokes equations. The particle's motions, including translation and rotation, are governed, respectively, by the Newton's second law and the Euler equations without using any approximation models for the lift and drag forces. The coupled mathematical model is numerically solved by combining immersed boundary with lattice Boltzmann method (IB-LBM). We find that the Reynolds number (Re), the particle's initial position, particle's density and diameter are the influential parameters in this process. The equilibrium positions and their stabilities of aerosols are different from those suspended in liquid.

Graphical abstract

Keywords

Fully resolved simulation; Bioaerosol; Lattice Boltzmann method; Immersed boundary method

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