Investigation of the Droplet Impingement on a Hydrophobic Surface with a Fixed Particle

The experimental investigations of droplet impingement on surfaces are quite common. However, the studies on the impact of droplet on particle embedded on flat surfaces are quite rare and need special attention. The image of droplet impact on flat hydrophobic surface with and without particle has been thoroughly analysed with the help of high-speed imagimetry technique. At low Weber numbers, rebounding was observed for flat surface without particle, whereas high Weber numbers resulted in jetting and fragmentation. For particle embedded flat surfaces, at low Weber numbers, pinning of droplet is observed, and at higher Weber numbers, fragmentation takes place.