Abstract：To investigate the subsequent development of drop impact in impinging stream, the theoretical model was established to correctly reflect the droplet collision and subsequent development. The proposed model was used to simulate the coalescence or the secondary atomization by droplet collision in coaxially opposed two gasliquid impinging stream. The particle size distribution of droplets between two nozzles was theoretically investigated, and the effects of size, velocity, viscosity and impact angle on droplet size distribution were analyzed. The simulation results show that the smaller the droplet size is, the greater the probability of collision coalescence is. The greater the viscosity is, the greater the probability of collision coalescence is. Droplets occur coalescence when the velocities are small. With the increasing of velocity, the probability of secondary atomization is increased. Under the same conditions, when droplets occur oblique impact, the probability of secondary atomization is larger than that for direct impact.
2016, Vol. 37 
