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The "Wimple" : rippled deformation of a fluid drop caused by hydrodynamic and surface forces during thin film drainage

journal contribution
posted on 06.12.2017, 00:00 by L Clasohm, Jason Connor, O Vinogradova, R Horn
It is well-known that hydrodynamic pressures in a thin draining liquid film can cause inversion of the curvature of a drop or bubble surface as it approaches another surface, creating a so-called “dimple”. Here it is shown that a more complicated rippled shape, dubbed a “wimple”, can be formed if a fluid drop that is already close to a solid wall is abruptly pushed further toward it. The wimple includes a central region in which the film remains thin, surrounded by a ring of greater film thickness that is bounded at the outer edge by a barrier rim where the film is thin. This shape later evolves into a conventional dimple bounded by the barrier rim, which then drains in the normal way. During the evolution from wimple to dimple, some of the fluid in the thicker part of the film ring flows toward the central region before eventually draining in the opposite direction. Although the drop is pressed toward the wall, the central part of the drop moves away from the wall before approaching it again. This is observed even when the inward push is too small to create a wimple.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

21

Issue

18

Start Page

8243

End Page

8249

Number of Pages

7

ISSN

0743-7463

Location

United States

Publisher

American Chemical Society

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Max-Planck-Institut für Polymerforschung, Mainz; Rossiĭskaia͡ akademiia͡ nauk; TBA Research Institute; University of South Australia;

Era Eligible

Yes

Journal

Langmuir.

Exports

CQUniversity

Exports