The authors develop 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 based on a switchable, spatially asymmetric, periodic interaction of the free surface of the film and the solid substrate. The concept is exemplified using an evolution equation for a dielectric liquid film under an inhomogeneous voltage. The authors analyze 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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