Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/1756
Título: Contact angle of a hemispherical bubble: An analytical approach
Autor: Teixeira, M. A. C.
Teixeira, Paulo Ivo Cortez
Palavras-chave: Foams and Emulsions
Contact Lines
Data: 1-Out-2009
Editora: Academic Press Inc Elsevier Science
Citação: Teixeira M A C, Teixeira P I C. Contact angle of a hemispherical bubble: An analytical approach. Journal of Colloid and Interface Science. 2009: 338 (1), 193-200.
Resumo: We have calculated the equilibrium shape of the axially symmetric Plateau border along which a spherical bubble contacts a flat wall, by analytically integrating Laplace's equation in the presence of gravity, in the limit of small Plateau border sizes. This method has the advantage that it provides closed-form expressions for the positions and orientations of the Plateau border surfaces. Results are in very good overall agreement with those obtained from a numerical solution procedure, and are consistent with experimental data. In particular we find that the effect of gravity on Plateau border shape is relatively small for typical bubble sizes, leading to a widening of the Plateau border for sessile bubbles and to a narrowing for pendant bubbles. The contact angle of the bubble is found to depend even more weakly on gravity. (C) 2009 Elsevier Inc. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/1756
ISSN: 0021-9797
Aparece nas colecções:ISEL - Física - Artigos

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