Structure of circulation flows in polymer solution droplets receding on flat surfaces

Yu Yoshitake, Shohei Yasumatsu, Masayuki Kaneda, Koichi Nakaso, Jun Fukai

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In a previous report where internal flows were experimentally visualized in polymer solution droplets receding on a lyophobic surface [Kaneda et al., Langmuir 2008, 24, 9102-9109], the direction of the circulation flow was found to depend on solvent and solute concentration. To identify the reason for this finding, the internal flow in the droplet is investigated numerically. Amathematical model predicts that double circulation flows initiate after a single flowdevelops at high Marangoni numbers, while only a single circulation flow develops at low Marangoni numbers. The dependencies of the calculated velocities on the solvent and the initial solute concentration agree qualitatively with experiment. It is concluded that the difference of the flow directions that were investigated experimentally is due to such a change in the flow structures. The effects of the contact angle and dimensions on transport phenomena in a droplet are also discussed.

Original languageEnglish
Pages (from-to)3923-3928
Number of pages6
JournalLangmuir
Volume26
Issue number6
DOIs
Publication statusPublished - Mar 16 2010
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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