Dynamics of sliding drops on superhydrophobic surfaces

Details Dynamics of sliding drops on superhydrophobic surfaces Dynamics of sliding drops on superhydrophobic surfaces

2006-05-10

arxiv.org/abs/cond-mat/0605253v1

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 4 figures, accepted for publication in Europhys. Lett

Scientific paper

10.1209/epl/i2005-10597-8

We use a free energy lattice Boltzmann approach to investigate numerically the dynamics of drops moving across superhydrophobic surfaces. The surfaces comprise a regular array of posts small compared to the drop size. For drops suspended on the posts the velocity increases as the number of posts decreases. We show that this is because the velocity is primarily determined by the contact angle which, in turn, depends on the area covered by posts. Collapsed drops, which fill the interstices between the posts, behave in a very different way. The posts now impede the drop behaviour and the velocity falls as their density increases.

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