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Gas flow through nanoscale conduits shows distinctly different physics compared to flow at the macroscale.
One of the first manifestations of this is the appearance of wall slip. Here we consider the oscillatory flow of an incompressible
Newtonian gas through a circular nanotube, with first order wall slip due to rarefaction. It was found that the major
effect of wall slip at lower oscillation frequencies is to alter the instantaneous velocity profiles from Poiseuille-like to
more plug-like, with an overall enhancement to the fluid velocity magnitude. However, at higher frequencies the enhancement
to velocity magnitude due to wall slip is greatly diminished, and rarefaction introduces a region of backflow
near the centerline of the nanotube. These flow characteristics may have important implications for the design of various
practical applications of unsteady gas flow through nanoscale conduits, from fuel cell membranes to gas-powered
nanomachines constructed from carbon nanotubes.