| Droplet dispersion in the near-field of two coaxial air flows is investigated both experimentally and numerically. The setup consists of an inner pipe of finite length enclosed into an outer pipe, both aligned to a common axis. Vortex shedding is induced downstream at the end of the inner pipe where the inner and outer flows merge together. A string of mono-sized droplets is injected into the vortex street. First, the flow pattern is characterized by series of PIV and LDA measurements and then the droplet-vortex interaction is investigated by means of phase-locked PIV imaging. The same two-phase flow configuration is calculated numerically by a Lagrangian particle tracking method coupled to a Large Eddy Simulation (LES) of the air flow. The results are validated against the experimental data and the unsteady droplet dispersion is analyzed and discussed. |
