Experimental and model studies of various size water droplet impacting
on a hydrophobic surface
Droplet impact on a hydrophobic surface is considered and the influence
of the droplet volume on the impact characteristics is analyzed.
Pressure variation and the characteristics of the droplet in the
spreading and retraction cycles are numerically predicted incorporating
the conditions adopted in the experiments. The dynamics of the impacting
droplet on the hydrophobic surface is simulated and the impacting
droplet motion is recorded using the high speed recording system. It is
found that the numerical predictions of the impacting droplet shape and
height ratios during the spreading and the contraction cycles are in
good agreement with those of the experimental data. Increasing droplet
volume increases: i) the peak pressure in the droplet fluid upon the
impact and ii) the transition period of the droplet on the hydrophobic
surface. Increasing droplet volume enhances peak velocity of the droplet
spreading on the surface.