Numerical Modeling of Micro-Particle Transportation in Transverse Wind Environment

In order to study the characteristics of particle transportation in a jet issuing into a transverse wind environment, computational fluid dynamics (CFD) were employed to model a particle laden jet in transverse flow with the velocity ratio of 2.68. The Reynolds number based on the jet diameter is 14,047, while the particle Reynolds number base on the particle diameter (0.1μm-15μm) varies from 0.34 to 45.6, indicating that the Stokes number for particles lies between 6.88×10^-4 and 1.55×10¹. Results showed that the particle transportation was affected seriously by Stokes number, i.e. particle concentration based trajectories differed a lot from those defined by gas velocity when the Stokes number increased. The Counter-rotating Vortex Pair (CVP) has a significant effect on the preferential accumulation of particles when the Stokes number is larger than 1×100, whereas the CVP was suppressed by the particle-laden jet when the Stokes number is smaller than 1×10-3 in this work.