The high-speed camera was applied to measure droplet deformation and breakup in the continuous and uniform air jet flow. Impacts of the initial diameter on breakup mode

deformation time

deformation and breakup total time and non-dimensional Sauter mean diameter were obtained. Result shows that

critical Weber number increases with the increasing initial diameter. The breakup model is changed into hybrid breakup model constituted by many single breakup models with the increasing initial diameter. Under the same Weber numbers

the deformation time and deformation and breakup total time in the region of larger diameter are both larger than the region of the smaller diameteras the Weber number increased

the deformation time showes the linear variation of first decreasing and then keeping the same

and the deformation and breakup total time showes the linear variation of first decreasing then increasing and decreasing again. The impact of the initial diameter is stronger than the impact of initial relative velocity of gas-liquid on non-dimensional Sauter mean diameter.