  In recent years, manipulation of particles by inertial microfluidics has
attracted significant attention. 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 motion in a 3D straight
microchannel with rectangular cross section by fully resolved simulation of the
particle-air flow based on the contiuum model. The air flow is modeled by the
Navier-Stokes equations, and particle's motions, including transition 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
numer, the particle's initial position, particle's density, and particle's
diameter are the influential parameters in this process. the equilibrium
positions and their stabilities of aerosols are different form those suspended
in liquid.
