Elastic deformation due to tangential capillary forces

S. Das, Antonin Marchand, Bruno Andreotti, Jacobus Hendrikus Snoeijer

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Abstract

A sessile liquid drop can deform the substrate on which it rests if the solid is sufficiently “soft.” In this paper we compute the detailed spatial structure of the capillary forces exerted by the drop on the solid substrate using a model based on Density Functional Theory. We show that, in addition to the normal forces, the drop exerts a previously unaccounted tangential force. The resultant effect on the solid is a pulling force near the contact line directed towards the interior of the drop, i.e., not along the interface. The resulting elastic deformations of the solid are worked out and illustrate the importance of the tangential forces
Original languageUndefined
Pages (from-to)072006-1-072006-11
Number of pages11
JournalPhysics of fluids
Volume23
Issue number7
DOIs
Publication statusPublished - 2011

Keywords

  • density functional theory
  • Elasticity
  • drops
  • Deformation
  • Capillarity
  • IR-78776
  • METIS-278189

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