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Droplet deformation and breakup is an important issue that involved in the aircraft and engine icing field especially in the case of the Supercooled Large Droplets (SLD). In this paper, the modes of SLD breakup were discussed in detail based upon the classical theories of droplet breakup and typical icing conditions. It was found that the breakup modes involved in SLD are mainly vibration breakup, bag-type breakup, multimode breakup and shear breakup. A breakup model composed of the typical SLD breakup types was proposed.

Aircraft icing causes a great threaten to flight safety. With the development of anti-icing or de-icing systems for aircraft, some attention has been paid on coating strategies for an efficient way to prevent water remaining on the surface. By application of hydrophobic or super-hydrophobic coatings, characterized by low surface adhesion, shedding of liquid from the surface can be enhanced. The motivation behind this work is to identify the way that wettability affects the motion of runback water, and establish an empirical formula of critical departure diameter. The surface property is characterized by the equilibrium contact angle and the hysteresis angle. The relationship between the air speed and the droplet shedding diameter is studied, corresponding to different surfaces.