Fluid Behaviors on Superhydrohobic Surface :

Sliding of a Water Droplet, Removing an Air Layer in Flowing Water

Abstract

The evaluation of the surface wettability has been researched from static situation by the contact angle measurement, which bases on Young's equation. Surfaces with a water contact angle greater than 150° (i.e. superhydrophobic surfaces) are currently a subject of great interest and intensive study. This paper reviews the reduction of fluid-flow resistance using the superhydrophobic coating. The latest findings, which are physical model of a sliding water droplet, movement of water droplet in the electric field and retention of air layer in flowing water, are caught quantitatively and visually.