Mixing of spray in crossflow in rectangle tube

The droplets flow dynamic in the crossflow mixing is experimentally studied by using of PIV. With single and double nozzles, the basic flow field along the crossflow and the horizontal velocity of the droplets are determined in the mixing. In the crossflow, the maximum horizontal velocity of droplets is twice time as crossflow velocity. However, in the counter-rotating vortex pairs, droplet velocity is lower than crossflow, and the droplet residents more long time. With double nozzles, the droplet dense area shows as a long-narrow triangle and the width of the dense area increase with the decrease of the momentum flux ratio. Under the action of shear force, coherent structure appears on droplet distribution.