Transport of free surface liquid films and drops by external ratchets and self-ratcheting mechanisms

Details Transport of free surface liquid films and drops by external ratchets and self-ratcheting mechanisms Transport of free surface liquid films and drops by external ratchets and self-ratcheting mechanisms

2010-01-14

arxiv.org/abs/1001.2417v1

U. Thiele, K. John, Chem. Phys. 375 (2010) 578

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 13 figures

Scientific paper

10.1016/j.chemphys.2010.07.011

We discuss the usage of ratchet mechanisms to transport a continuous phase in several micro-fluidic settings. In particular, we study the transport of a dielectric liquid in a heterogeneous ratchet capacitor that is periodically switched on and off. The second system consists of drops on a solid substrate that are transported by different types of harmonic substrate vibrations. We argue that the latter can be seen as a self-ratcheting process and discuss analogies between the employed class of thin film equations and Fokker-Planck equations for transport of discrete objects in a 'particle ratchet'.

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