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The equilibrium shape of an axisymmetric sessile drop subject to local stresses
Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
Ian Wark Research Institute, Levels Campus, University of South Australia, Mawson Lakes, SA 5086, Australia.
2001 (English)In: Journal of Physics A: Mathematical and General, ISSN 0305-4470, E-ISSN 1361-6447, Vol. 34, no 38, 7849-7866 p.Article in journal (Refereed) Published
Abstract [en]

The exact equation describing the shape of a fluid drop under the action of local surface stresses induced by colloidal interactions is derived without resorting to any of the approximations inherent in the profile equation currently employed in the literature. The exact equation implies, and numerical examples confirm, that repulsive external (i.e. positive) surface energies assist in stabilizing the drop against deformation, while attractive (i.e. negative) energies destabilize the drop, promoting or enhancing deformation. An inherent singularity in the governing differential equation (absent from the approximate equations currently used) when the surface energy (surface tension) is identically matched by an external attractive energy represents an instability limit. Explicit bounds are established for a further instability criterion and for the hydrostatic pressure difference across the interface. An exact equation for the radial extent of the sessile drop and some numerical examples are also presented.

Place, publisher, year, edition, pages
2001. Vol. 34, no 38, 7849-7866 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-47256DOI: 10.1088/0305-4470/34/38/310OAI: oai:DiVA.org:liu-47256DiVA: diva2:268152
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Miklavcic, Stan

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