Seyed Javad Pishbin - Student Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
Alireza Sheikhi - Student Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
Javid Zohrabi - Graduate Student Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
Mohammad Pasandideh-Fard - Professor Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

In this paper, the impact of water drops on hydrophobic cylinders is studied using both experiments and simulations. The diameter of the generated water droplets is 2.54nun. A high speed catnera is used to capture photos of the impact with a time step of lms. The diameters of the cylinders used ranged from 0.48mm to 1.62mm. After the impact, the droplet separates into two different sub-droplets at each side of the cylinder. Smaller secondary droplets are also generated after the impact. A change in the behavior of the drop after the impact is observed cotnpared to the impact on hydrophilic cylinders. The effect of changing the location of the impact and the off-centric collision is also researched. A numerical simulation of the impact is also obtained using the interFoam solver of the OpenFoam software. The technique used by thesolver is the volume-of-fluid (VOF) method. The numerical simulations are then validated by a comparison of the results with those of the experimental images.

droplet Impact. Cylindrical Hydrophobic Surfaces, Numerical Simulation Surfaces