AVS 56th International Symposium & Exhibition
    Surface Science Thursday Sessions
       Session SS-ThP

Paper SS-ThP14
Reduction of Friction Drag by Superhydrophobic / Superhydrophilic Coatings

Thursday, November 12, 2009, 6:00 pm, Room Hall 3

Session: Surface Science Poster Session
Presenter: M. Sakai, Kanagawa Academy of Science and Technology, Japan
Authors: M. Sakai, Kanagawa Academy of Science and Technology, Japan
A. Nakajima, Tokyo Institute of Technology, Japan
Correspondent: Click to Email
Recently, the importance of controlling wettability on the solid surface is recognized in various industries. In the current paper, we evaluated friction drag of water on various surfaces including superhydrophobic / superhydrophilic coatings. The amount of friction drag was evaluated by the decrease of hydrostatic pressure during flowing in the tubes coated by various materials. When Reynolds number is smallest, superhydrophobic coating provides small friction drag. On the other hand, a superhydrophobic coating provided smallest friction drag when Reynolds number is 6000. The mechanism of this difference was discussed from the viewpoints of fluid mechanics and surface materials science.