title: Apparent hydrodynamic slip induced by density inhomogeneities at fluid-solid interfaces.
abstract: This study demonstrates that even when the no-slip condition is satisfied on the surface of a solid wall, apparent hydrodynamic slip can be clearly seen owing to a continuous variation of viscosity associated with density inhomogeneity near the wall. The relationship between the apparent slip length and the local fluid properties, such as viscosity and/or density, has been established theoretically. The apparent slip length depends on the flow type and three cases are considered: shear-driven flow, body force-driven flow, and flow driven by external force acting on adsorbed solutes. Particle-based simulations have been performed and the consistency between our theory and the simulation has been verified.
authors.affiliation: Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China.
authors.forename: Junbo
authors.initials: J
authors.lastname: Xu
authors.forename: Chao
authors.initials: C
authors.lastname: Yang
authors.forename: Yu-Jane
authors.initials: YJ
authors.lastname: Sheng
authors.forename: Heng-Kwong
authors.initials: HK
authors.lastname: Tsao