Kinetics of Triple Line Motion during Evaporation

M. E. R. Shanahan*, K. Sefiane

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

When a sessile drop evaporates in an unsaturated environment, it may change its geometry during mass loss in a variety of ways, depending largely on the surface state of the solid in contact. Under some circumstances, "pinning" of the wetting triple line (TL) to the solid surface may occur, leading to decrease of contact angle. Subsequent "de-pinning" leads to relatively rapid TL recession and accompanying contact angle increase, only to be followed by pinning again. Thus a "stick-slip" cycle is set up. Here we consider experimental results of ethanol drops on Teflon (R), and both apply and develop further the ideas presented some years ago in a simple theoretical study of the possible mechanisms involved in stick-slip behaviour.

Original languageEnglish
Title of host publicationCONTACT ANGLE, WETTABILITY AND ADHESION, VOL 6
EditorsKL Mittal
Place of PublicationLEIDEN
PublisherVSP BV-C/O BRILL ACAD PUBL
Pages19-31
Number of pages13
Publication statusPublished - 2009
Event6th International Symposium on Contact Angle, Wettability and Adhesion - Orono, Montenegro
Duration: 14 Jul 200816 Jul 2008

Conference

Conference6th International Symposium on Contact Angle, Wettability and Adhesion
Country/TerritoryMontenegro
Period14/07/0816/07/08

Keywords

  • Contact angle
  • drop evaporation
  • "stick-slip"
  • triple line
  • wetting hysteresis
  • CONTACT-ANGLE
  • SESSILE DROP
  • VAPOR

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