An investigation of droplet bubble and liquid jet dynamics on superhydrophobic and hydrophobic surfaces

In this study, the differences between the hydrophobic and superhydrophobic surfaces from the hydrophilic surfaces and dynamics of a liquid droplets, gas bubbles and liquid jets have been examined. for a droplet, there remains a large contact angle on the superhydrophobic surfaces, while the gas bubble spreads on the surface with a low contact angle. there are two different conditions for superhydrophobic surfaces (i.e., cassie and wenzel) and the contact angles are high for those two surfaces. however, contact angle hysteresis is low and high for the cassie and wenzel states, respectively. the droplet remains on the superhydrophobic surface touching a small area with the surface, and it can be removed from the surface by a very low external forces. when the superhydrophobic surfaces are submerged in a liquid, it is covered by a thin air layer. in this case, the air bubble, which is sent from underneath of the surface, bursts and disappears on the surface. the superhydrophobic surfaces have potential applications for icing, film/dropwise condensation and boiling.