Eur. Phys. J. E 2, 367-376
Dewetting on porous media with aspiration
A. Aradian - E. Raphaël - P.G. de Gennes
Physique de la Matière Condensée, Collège de France, 11 place Marcelin
Berthelot, 75231 Paris Cedex 05, France
Achod.Aradian@college-de-france.fr,
Elie.Raphael@college-de-france.fr,
Pierre-Gilles.deGennes@espci.fr
Received 5 October 1999 and Received in final form 7 February 2000
Abstract
We consider a porous solid covered with a water film
(or with a drop) in situations where the liquid is pumped in,
either spontaneously (if the porous medium is hydrophilic) or
mechanically (by an external pump). The dynamics of dewetting is
then strongly modified. We analyse a few major examples, a)
horizontal films, which break at a certain critical thickness, b)
the "modified Landau-Levich problem'' where a porous plate moves
up from a bath and carries a film: aspiration towards the plate
limits the height H reached by the film, c) certain situation
where the hysteresis of contact angles is important.
PACS
68.45.Gd Wetting
- 68.15.+e Liquid thin films
- 81.05.Rm Porous materials; granular materials
Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag
