Flash boiling atomization is one of the more efficient methods to form a high quality fine spray. This method is nowwidely used in several applications including household, painting and in the pharmaceutical industry; some otherimportant applications are in sight, in particular in fuel injection systems. Numerous spraying systems are designed toform fine and uniform mist, usually by utilizing a mechanical energy to disintegrate the continuous liquid phase into adispersed phase. The flash boiling method exploits the thermal energy of the fluid itself for that purpose while thespray is formed during a rapid vaporization of the fluid (or the propellant in a binary mixture) which is achieved by highdepressurization rate (flash boiling). In a binary mixture for example, the evaporation of the propellant during theinjection shatters the liquid solvent into small and uniform droplets. Former studies [1], [2], [3] showed that the flashboiling atomization results in high quality fine spray that is characterized by a low Sauter Mean Diameter (SMD) whileusing a relatively low operating pressure. For example, it has been shown [4] that for binary mixtures, for a pressuredifference of less than 300 kPa, the SMD is lower than 50 μm.
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