This may be define ad breaking liquid into droplets. Item like fire sprinklers,crop sprayers,aerosols and so on utilise atomisation methods for cold liquids. There is very extensive literature on this surveyed in Yule and Dunkley and Nasr et al. Clearly, the atomisation of melts,especially at tenperatures as high as molten steels, is a verry different proposition in practical term, but some techniques used for cold are also apolied to metals. These include gas and air atomisation,which are referred to as 'two fluid' atomisation methode (along with water atomisation, which is almost unique to melt atomisation), ultrasonic and centrifugal atomisation.