Scale effect on dropwise condensation on superhydrophobic surfaces

Ching Wen Lo, Chi-Chuan Wang, Ming-Chang Lu*

*Corresponding author for this work

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

Micro/nano (two-tier) structures are often employed to achieve superhydrophobicity. In condensation, utilizing such a surface is not necessarily advantageous because the macroscopically observed Cassie droplets are usually in fact partial Wenzel in condensation. The increase in contact angle through introducing microstructures on such two-tier roughened surfaces may result in an increase in droplet departure diameter and consequently deteriorate the performance. In the meantime, nanostructure roughened surfaces could potentially yield efficient shedding of liquid droplets, whereas microstructures roughened surfaces often lead to highly pinned Wenzel droplets. To attain efficient shedding of liquid droplets in condensation on a superhydrophobic surface, a Bond number (a dimensionless number for appraising dropwise condensation) and a solid-liquid fraction smaller than 0.1 and 0.3, respectively, are suggested.

Original languageEnglish
Pages (from-to)14353-14359
Number of pages7
JournalACS Applied Materials and Interfaces
Volume6
Issue number16
DOIs
StatePublished - 1 Jan 2014

Keywords

  • Bond number
  • Cassie droplets
  • condensation
  • solid-liquid fraction
  • superhydrophobicity
  • two-tier roughness

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