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We characterize the dynamics of an electrolyte embedded in a varying-sectionchannel under the action of a constant external electrostatic field. By meansof molecular dynamics simulations we determine the stationary density, chargeand velocity profiles of the electrolyte. Our results show that when the Debyelength is comparable to the width of the channel bottlenecks a concentrationpolarization along with two eddies sets inside the channel. Interestingly, uponincreasing the external field, local electroneutrality breaks down and chargepolarization sets leading to the onset of net dipolar field. This novelscenario, that cannot be captured by the standard approaches based on localelectroneutrality, opens the route for the realization of novel micro andnano-fluidic devices.

Charge polarization, local electroneutrality breakdown and eddy formation due to electroosmosis in varying-section channels