Direct experimental evidences for flow with slip at hexadecane - solid interfaces

The limit condition for the flow rate at the wall for a Newtonian fluid wit h various solid/liquid interfaces was studied experimentally using an origi nal high resolution technique. A notable interfacial slipping was shown for the hexadecane flowing on a surface with low roughness and covered with me thyl groups (non wetting surface for the hexadecane). The systematic study of various modified surfaces made it possible to identify two key parameter s fixing the amplitude of slipping at the wall and acting in an antagonisti c way on the roughness of the surface (geometric and chemical) and the flui d/surface interactions.