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Physics of Fluids / Volume 19 / Issue 11 / BRIEF COMMUNICATIONS

Phys. Fluids 19, 118105 (2007); http://dx.doi.org/10.1063/1.2800040 (4 pages)

Young’s law and the effects of interfacial energy on the pressure at the solid-fluid interface

Ivan Lunati

School of Architecture, Civil and Environmental Engineering, EPF Lausanne, Lausanne CH-1015, Switzerland

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(Received 29 September 2006; accepted 2 August 2007; published online 12 November 2007)

In a recent paper [ R. Finn, Phys. Fluids 18, 047102 (2006) ] the attention has been drawn on the tension component perpendicular to the solid surface that results from Young’s law. Considering the problem of a solid sphere floating in zero gravity, it has been argued that this component yields a spurious net vertical force acting on the sphere, which remains unbalanced. Therefore, the validity of Young’s law has been questioned in favor of an energy argument. The scope of this Brief Communication is to restate the equivalence between the energy and the force descriptions of the problem. It is shown that there is no contradiction in Young’s law if one accounts for the different stress acting on the solid surface in the two fluids. The net force resulting from the latter balances the force resultant associated with the tension component perpendicular to the solid.

© 2007 American Institute of Physics

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KEYWORDS and PACS

Keywords

pressure, surface energy

PACS

  • 68.03.Cd

    Surface tension and related phenomena

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2800040

PUBLICATION DATA

ISSN

1070-6631 (print)  
1089-7666 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

    R. Finn, “Contact angle in capillarity,” Phys. Fluids 18, 047102 (2006)PHFLE6000018000004047102000001.


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