Electrostatic suppression of the "coffee stain effect"

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

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The dynamics of a slender, evaporating, particle-laden droplet under the effect of electric fields are examined. Lubrication theory is used to reduce the governing equations to a coupled system of evolution equations for the interfacial position and the local, depth-averaged particle concentration. The model incorporates the effects of capillarity, viscous stress, Marangoni stress, elecrostatically induced Maxwell stress, van der Waals forces, concentration-dependent rheology, and evaporation. Via a parametric numerical study, the one-dimensional model is shown to recover the expected inhomogeneous ring-like structures in appropriate parameter ranges due to a combination of enhanced evaporation close to the contact line, and resultant capillarity-induced flow. It is then demonstrated that this effect can be significantly suppressed via the use of carefully chosen electric fields. Finally, the three-dimensional behavior of the film and the particle concentration field is briefly examined.

LanguageEnglish
Pages5849-5858
Number of pages10
JournalLangmuir
Volume30
Issue number20
Early online date2 May 2014
DOIs
Publication statusPublished - 27 May 2014

Fingerprint

coffee
Coffee
Electrostatics
Coloring Agents
Capillarity
retarding
electrostatics
Evaporation
Electric fields
evaporation
Van der Waals forces
electric fields
ring structures
lubrication
Rheology
rheology
Contacts (fluid mechanics)
Lubrication

Keywords

  • electric fields
  • evaporation
  • Van der Waals forces

Cite this

Wray, A. W., Papageorgiou, D. T., Craster, R. V., Sefiane, K., & Matar, O. K. (2014). Electrostatic suppression of the "coffee stain effect". Langmuir, 30(20), 5849-5858. https://doi.org/10.1021/la500805d
Wray, Alexander W. ; Papageorgiou, Demetrios T. ; Craster, Richard V. ; Sefiane, Khellil ; Matar, Omar K. / Electrostatic suppression of the "coffee stain effect". In: Langmuir. 2014 ; Vol. 30, No. 20. pp. 5849-5858.
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Wray, AW, Papageorgiou, DT, Craster, RV, Sefiane, K & Matar, OK 2014, 'Electrostatic suppression of the "coffee stain effect"' Langmuir, vol. 30, no. 20, pp. 5849-5858. https://doi.org/10.1021/la500805d

Electrostatic suppression of the "coffee stain effect". / Wray, Alexander W.; Papageorgiou, Demetrios T.; Craster, Richard V.; Sefiane, Khellil; Matar, Omar K.

In: Langmuir, Vol. 30, No. 20, 27.05.2014, p. 5849-5858.

Research output: Contribution to journalArticle

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