On the scale diffusivity of a 2-D liquid atomization process analysis

► A scale diffusivity expression of a liquid atomization process has been established. ► This expression is similar to the established in turbulence. ► This expression introduces a characteristic Weber number of the injector. ► The scale space diffusion time is equal to the time of surface tension force actions. ► The scale diffusivity analysis introduces new non-dimensional numbers characterizing liquid atomization.