  We analyse surface-fluctuations-driven fluid flow through nano-channels to
investigate the interplay between boundary layer flow structures and the bulk
flow of fluid under a pressure-head. Surface fluctuations of a wide range of
frequencies (up to several thousands of Hertz) in a nano-channel keep the flow
in the low Reynolds number regime. Using this advantage of low Reynolds number
flow, we develop a perturbation analysis of the fluid flow that clearly
distinguishes the bulk flow under a pressure head around the axis of a
nano-tube from its surface flow structure induced by fluctuations. In terms of
particle transport under such flow conditions, there exists the opportunity to
drag particles near the periphery of the nano-tube in a direction opposite to
the bulk flow near the axis. This can potentially find applications in the
separation, trapping, and filtration of particles under surface-driven flow
through nano-tubes under widely varying conditions.
