The Wimple: a Rippled Deformation of a Wetting Film during its Drainageстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:It has long been accepted that hydrodynamic pressure in a draining fluid film can cause inversion of
curvature of a fluid-fluid interface, creating the so-called dimple. However, it was recently
discovered that a different shape, dubbed a wimple, can be formed if a bubble/drop is initially in the
field of repulsive surface forces, so that a wetting film is formed. The film profile then includes a
central region in which the film remains thin, surrounded by a ring of greater film thickness and
bounded at the outer edge by a barrier rim. This shape later evolves to a conventional dimple, which
then drains in the usual way. Here we carry out numerical simulations of the draining film evolution
that allow us to uncover the physical mechanism responsible for wimple formation. Simple
analytical estimates are then obtained for characteristic times of different stages of drainage, and are
shown to be in good agreement with experimental data. We demonstrate that wimpling is a general
phenomenon that can be encountered in many different systems.