Liquid flow over a substrate structured by seeded nanoparticles

Lukyanov, A. (2009) Liquid flow over a substrate structured by seeded nanoparticles. Physics Letters A, 373 (22). 1967 -1971 . ISSN 0375-9601 doi: 10.1016/j.physleta.2009.04.005

Abstract/Summary

Recent experiments have demonstrated that nanoparticles which sparsely distributed over a solid substrate can substantially change the flow conditions at the solid surface in the presence of slip. Inspired by these observations, the flow past tiny particles seeded on a solid substrate is investigated theoretically in the framework of an interface formation model. It has been shown, that even a single seeded nanoparticle can reduce significantly the measurable tangential component of hydrodynamic velocity at the substrate and affect the amount of the observed apparent slippage of the liquid. The effect from the particle manifests in a form of a long relaxation tail defined by the characteristic time of the interface formation process. A comparison with experiments has demonstrated a good agreement between theoretically predicted and experimentally observed values of the relaxation tail length scale.