A design principle for improved 3D AC electro-osmotic pumps

Details A design principle for improved 3D AC electro-osmotic pumps A design principle for improved 3D AC electro-osmotic pumps

2007-09-10

arxiv.org/abs/0709.1304v2

Physics

Fluid Dynamics

4 pages, 4 figures, submitted to Physical Review E

Scientific paper

10.1103/PhysRevE.77.055303

Three-dimensional (3D) AC electro-osmotic (ACEO) pumps have recently been developed that are much faster and more robust than previous planar designs. The basic idea is to create a ``fluid conveyor belt'' by placing opposing ACEO slip velocities at different heights. Current designs involve electrodes with electroplated steps, whose heights have been optimized in simulations and experiments. Here, we consider changing the boundary conditions--rather than the geometry--and predict that flow rates can be further doubled by fabricating 3D features with non-polarizable materials. This amplifies the fluid conveyor belt by removing opposing flows on the vertical surfaces, and it increases the slip velocities which drive the flow.

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