Parameters Affecting Slip Length at the Nanoscale

Abstract

We investigate liquid flows in various nanochannels and present the effect of all physical parameters affecting slip length at the boundary using molecular dynamics simulations. Our computational model shows that slip exists at the nanoscale and its value is significantly affected both by surface and fluid characteristics. Larger slip lengths are observed at small channel sizes, dense liquids, external driving forces of large magnitude and at higher temperatures. We also depict the effect of geometric wall roughness (of various groove lengths and heights) and wall wettability strength on slip length. Finally, we discuss the implications of the results on the design of nanofluidic devices.