Beating the teapot effect

Details Beating the teapot effect Beating the teapot effect

2009-10-17

arxiv.org/abs/0910.3306v1

Phys. Rev. Lett. vol 104, 084503 (2010)

Physics

Condensed Matter

Soft Condensed Matter

4 pages; movies at http://lpmcn.univ-lyon1.fr/~lbocquet

Scientific paper

We investigate the dripping of liquids around solid surfaces in the regime of inertial flows, a situation commonly encountered with the so-called "teapot effect". We demonstrate that surface wettability is an unexpected key factor in controlling flow separation and dripping, the latter being completely suppressed in the limit of superhydrophobic substrates. This unforeseen coupling is rationalized in terms of a novel hydro-capillary adhesion framework, which couples inertial flows to surface wettability effects. This description of flow separation successfully captures the observed dependence on the various experimental parameters - wettability, flow velocity, solid surface edge curvature-. As a further illustration of this coupling, a real-time control of dripping is demonstrated using electro-wetting for contact angle actuation.

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