Abstract: A comprehensive three-dimensional mathematical model, which adopted Euler-Lagrange approach, was developed to study the liquid membrane broken of twin-fluid atomizer in evaporative cooler. The influence of air-liquid mass ratio on Sauter Mean Diameter (SMD) of droplet and droplet size distribution on evaporation efficiency were analyzed, and the simulation results were compared with the experimental data. The results show that the simulation results coincide with the experimental data. The result shows that the SMD of droplet decreases with the increase of air-liquid ratio. The bestair-liquid ratio is 0.1,the SMD of droplet is 63 μm. Droplet penetration distance are less affected by initial velocity, which is mainly related to particle size. The simulation showed that with the diameter of droplet getting smaller, the complete evaporation time of droplet become shorter. Droplet with diameter less than 250 μm can be completely evaporated in 0.6 s, butthe maximum evaporation time of different drop diameter is 20 times higher.

Key words: atomization characteristic, evaporation, simulation, gas-liquidflow, flue gas