title: Patterning flows using grooved surfaces.
abstract: Through a simple analytical description we quantify how pressure-driven flows over grooved surfaces develop transverse components, which, for shallow grooves, can be modeled with simple anisotropic effective boundary conditions. Helical recirculation results in channels or capillaries with grooved walls. An experimental validation of our model is presented. Our analysis provides a workable guide for the design of 3D flows with simple patterns of grooved regions, e.g., to control the position of streams in the cross section of a channel or to promote mixing. Potential applications in microfluidics are outlined.
authors.affiliation: Department of Chemistry and Chemical Biology, Harvard University, Cambridge Massachusetts 02138, USA.
authors.forename: Abraham D
authors.initials: AD
authors.lastname: Stroock
authors.forename: Stephan K
authors.initials: SK
authors.lastname: Dertinger
authors.forename: George M
authors.initials: GM
authors.lastname: Whitesides
authors.forename: Armand
authors.initials: A
authors.lastname: Ajdari
mesh_terms: D000465:Algorithms; D016880:Anisotropy; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D008956:Models, Chemical; D036103:Nanotechnology; D013499:Surface Properties