Influence of substrate conductivity on circulation reversal in evaporating drops

W. D. Ristenpart, P. G. Kim, C. Domingues, J. Wan, H. A. Stone

Research output: Contribution to journalArticlepeer-review

392 Scopus citations

Abstract

Nonuniform evaporation from sessile droplets induces radial convection within the drop, which produces the well-known "coffee-ring" effect. The evaporation also induces a gradient in temperature and consequently a gradient in surface tension, generating a Marangoni flow. Here we investigate theoretically and experimentally the thermal Marangoni flow and establish criteria to gauge its influence. An asymptotic analysis indicates that the direction of the flow depends on the relative thermal conductivities of the substrate and liquid, kR≡kS/kL, reversing direction at a critical contact angle over the range 1.45<kR<2. We corroborate the theory experimentally and demonstrate that the Marangoni flow can significantly influence the resulting patterns of particle deposition.

Original languageEnglish (US)
Article number234502
JournalPhysical review letters
Volume99
Issue number23
DOIs
StatePublished - Dec 3 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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