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

Clasohm, Lucy Y., Connor, Jason N., Vinogradova, Olga I. and Horn, Roger G. 2005, The 'wimple' : rippled deformation of a fluid drop caused by hydrodynamic and surface forces during thin film drainage, Langmuir, vol. 21, no. 18, pp. 8243-8249, doi: 10.1021/la0508588.

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Title The 'wimple' : rippled deformation of a fluid drop caused by hydrodynamic and surface forces during thin film drainage
Author(s) Clasohm, Lucy Y.
Connor, Jason N.
Vinogradova, Olga I.
Horn, Roger G.
Journal name Langmuir
Volume number 21
Issue number 18
Start page 8243
End page 8249
Publisher American Chemical Society
Place of publication Washington, D. C.
Publication date 2005
ISSN 0743-7463
1520-5827
Summary 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.
Notes First published online 29th July, 2005
Language eng
DOI 10.1021/la0508588
Field of Research 030603 Colloid and Surface Chemistry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2005, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30041437

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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