title: Hydrodynamic drag-force measurement and slip length on microstructured surfaces.
abstract: In this paper, a drainage experiment of water between a borosilicate sphere and a microstructured surface constituted by regularly spaced pillars is presented. The microstructured surface has two parts: on one part the liquid forms a Cassie interface and on the second it forms a Wenzel interface. The measured hydrodynamic drag force is larger on the Cassie part compared to the Wenzel part. Furthermore, for the Cassie part, from the hydrodynamic drag force measurements on a pillar and between pillars the corresponding local slip lengths have been extracted. The area average slip length on the surface is in agreement with the value expected by Philip's equation.
authors.affiliation: Laboratoire Ondes et Matière d'Aquitaine, Université Bordeaux I, 351 cours de la Liberation, F-33405 Talence, France. a.maali@loma.u-bordeaux1.fr
authors.forename: A
authors.initials: A
authors.lastname: Maali
authors.forename: Y
authors.initials: Y
authors.lastname: Pan
authors.forename: B
authors.initials: B
authors.lastname: Bhushan
authors.forename: E
authors.initials: E
authors.lastname: Charlaix
mesh_terms: D003198:Computer Simulation; D017276:Friction; D057446:Hydrodynamics; D008956:Models, Chemical; D012212:Rheology / Q000379:methods*; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties; D014783:Viscosity