Effect of Surface Structures on Droplet Impact Over Flat and Cylindrical Surfaces

In this chapter, droplet impact and bounce off over different hydrophobic surfaces have been studied numerically. For that volume of fluid based solver has been used. The solver has been validated with the experimental observations of droplet impact on a flat surface. At first droplet, impact over a flat surface with and without pillars and stripes has been studied and directional spreading dynamics has been investigated. The study has been further extended for cylindrical surfaces and droplet split-off has been observed. Thereafter effect of different types of structured surfaces (pillared, axially striped, and circumferentially stripped) on the droplet split-off phenomena has been observed and the fluidic reason behind has been analyzed. Also, droplet angle of wrap and height over cylinder has been compared for different surface structures.