Vertical particle-laden jet flow with a horizontal crossflow*

It is well known that a cluster of particles (Stokes number around 1.0) exhibits the maximum concentration at the positions of higher strain rate (lower vorticity), so-called preferential concentration. While this has been studied mostly on small scale (turbulence scale), particle dispersions in a larger-scale motion have not been investigated widely. We experimentally study vertical particle-laden jet flows with a crossflow while varying the velocity ratio between jet and crossflow, and particle Stokes number (0.03-10.7). For each case, the single-phase flow is measured with a particle image velocimetry and then particle (Silicon, 10-75 um in size) distributions are measured separately, which is further quantified using Voronoi diagram analysis and planar nephelometry. Similar to previous studies, it is also measured that the maximum preferential concentration occurs when the Stokes number is near 1.0. Without a crossflow, the particles tend to accumulated on the center plane (dispersed mainly along the jet direction). However, with a crossflow, the particles move to the jet shear plane and are clustered around the particle source (i.e., jet exit). More discussions on the particle dispersion will be provided.