Liquid transport generated by a flashing field-induced wettability ratchet

Details Liquid transport generated by a flashing field-induced wettability ratchet Liquid transport generated by a flashing field-induced wettability ratchet

2006-11-15

arxiv.org/abs/physics/0611144v1

Appl. Phys. Lett. 90, 264102 (2007)

Physics

Fluid Dynamics

10 pages, 5 figures

Scientific paper

10.1063/1.2751582

We develop and analyze a model for ratchet-driven macroscopic transport of a continuous phase. The transport relies on a field-induced dewetting-spreading cycle of a liquid film with a free surface based on a switchable, spatially asymmetric, periodic interaction of the liquid-gas interface and the substrate. The concept is exemplified using an evolution equation for a dielectric liquid film under an inhomogeneous voltage. We analyse the influence of the various phases of the ratchet cycle on the transport properties. Conditions for maximal transport and the efficiency of transport under load are discussed.

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