Critical contact angles for liquid drops on inclined surfaces

Abdelrahman I. ElSherbini, Anthony M. Jacobi

Research output: Contribution to journalArticlepeer-review

Abstract

The contact angles of liquid drops on inclined plane surfaces have been investigated at critical conditions of sliding. Drops of two liquids were tested on eight surfaces covering a wide range of advancing and receding contact angles. Contact angles and contact line dimensions were observed for various drop sizes and surface inclination angles. The contact-angle variation along the circumference of the drop was best fit by a third-degree polynomial of the azimuthal angle. The findings lead to the development of a general relation between the advancing contact angle, the receding contact angle, and the maximum Bond number for a liquid-surface combination. This relation is well supported by data from the literature. The new relation allows the characterization of a surface by its advancing contact angle for a given liquid, and prediction of the corresponding receding angle and maximum drop size.

Original languageEnglish (US)
Pages (from-to)57-62
Number of pages6
JournalProgress in Colloid and Polymer Science
Volume128
DOIs
StatePublished - Dec 1 2004

Keywords

  • Contact angle
  • Drop size
  • Retention
  • Surface tension

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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