Evaporation of droplets on strongly hydrophobic substrates

Jutta M. Stauber, Stephen K. Wilson, Brian R. Duffy, Khellil Sefiane

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Abstract

The manner in which the extreme modes of droplet evaporation (namely the constant contact radius and the constant contact angle modes) become indistinguishable on sufficiently hydrophobic substrates is described. Simple asymptotic expressions are obtained which provide good approximations to the evolutions of the contact radius, the contact angle, and the volume of droplets evaporating in the extreme modes for a wide range of hydrophobic substrates. As a consequence, on sufficiently hydrophobic substrates it is appropriate to use the so-called "2/3 power law" to extrapolate the lifetimes of droplets evaporating in the constant contact radius mode as well as in the constant contact angle mode.
Original languageEnglish
Pages (from-to)2353-2360
Number of pages8
JournalLangmuir
Volume31
Issue number12
Early online date9 Mar 2015
DOIs
Publication statusPublished - 31 Mar 2015

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Keywords

  • droplet evaporation
  • hydrophobic substrates
  • constant contact radius
  • constant contact angle

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