Dynamics of spheroidal droplets impacting on hydrophobic surfaces

Droplet impact on a hydrophobic surface is affected by various parameters. In this draft, the effects of droplet shape, size, and velocity during its impact on a hydrophobic surface have been reported. Numerical simulations have been performed to investigate the impact characteristics of ellipsoid droplets with different aspect ratios. After impact, the spreading and recoiling rates of droplets with a low aspect ratio (oblate droplets) are higher than those with a higher aspect ratio (prolate droplets). However, the maximum spreading factor increases with the aspect ratio, indicating that droplets achieve a greater spread than oblate droplets. Additionally, oblate droplets demonstrate shorter spreading, recoiling, and bouncing durations than prolate droplets. The initial contact surface area and falling orientation of an ellipsoid droplet significantly influence these behaviors. The role of initial kinetic energy, represented by the Weber number, is more pronounced in prolate droplets than in oblate ones, with the aspect ratio's effects becoming more evident at higher kinetic energy levels.