Electrostatic suppression of the "coffee-stain effect"

Alexander W. Wray, Demetrios T. Papageorgiou, Richard V. Craster, Khellil Sefiane, Omar K. Matar

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The dynamics of a slender, nano-particle laden droplet are examined when it is subjected to an electric field. Under a long-wave assumption, the governing equations are reduced to a coupled pair of nonlinear evolution equations prescribing the dynamics of the interface and the depth-averaged particle concentration. This incorporates the effects of viscous stress, capillarity, electrostatically- induced Maxwell stress, van der Waals forces, evaporation and concentration-dependent rheology. It has previously been shown27 that electric fields can be used to suppress the ring effect typically exhibited when such a droplet undergoes evaporation. We demonstrate here that the use of electric fields affords many diverse ways of controlling the droplets.

Original languageEnglish
Pages (from-to)172-177
Number of pages6
JournalProcedia IUTAM
Publication statusPublished - 28 May 2015
EventIUTAM Symposium on Multiphase Flows with Phase Change - Hyderabad, India
Duration: 8 Dec 201411 Dec 2014


  • droplet
  • electrostatics
  • evaporation
  • nanoparticles
  • thin-film

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