Abstract
We present a fluidic device that shows ratchet-like characteristics for
particle transport at low Reynolds. The ratchet consists of a
two-dimensional saw-tooth channel, within which a laminar flow is
generated by imposing a longitudinal pressure gradient. Particle
trajectories are calculated by solving the continuity and Navier-Stokes
equations for the fluid flow and the equations for particle transport in
both flow directions. The ratchet-like effect is connected with a large
asymmetry in the mean transit time, with regard to flow direction, due
to particle motion within zones of low flow velocity near the asymmetric
wall profile. We show how to obtain ratchet of particles with select
Stokes under given flow conditions by adjusting the geometry of the
ratchet channel.
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