Electrowetting-Controlled Dropwise Condensation with Patterned Electrodes: Physical Principles, Modeling, and Application Perspectives

Harmen Hoek, Ranabir Dey, Frieder Mugele*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
12 Downloads (Pure)

Abstract

Patterning the wettability of solid surfaces is a successful strategy to control the dropwise condensation of vapor onto partially wetting solid surfaces. The condensation of water vapor onto electrowetting-functionalized surfaces is studied with structured co-planar electrodes. A detailed analysis of the experimental distribution of millions of drops reveals that despite the presence of contact angle hysteresis and the occurrence of random drop coalescence events, the preferential drop positions closely follow the numerically calculated local minima of the electrostatic energy for variable drop size. Even subtle transitions between competing preferred locations are properly reproduced by the model. Based on this quantitative understanding of the condensation patterns, a series of important follow-up steps that need to be taken to demonstrate a reliable performance gain in various applications focusing in particular on enhanced heat transfer is discussed.

Original languageEnglish
Article number2001317
JournalAdvanced materials interfaces
Volume8
Issue number2
DOIs
Publication statusPublished - 22 Jan 2021

Keywords

  • UT-Hybrid-D
  • electrowetting
  • fog harvesting
  • heat transfer
  • wetting
  • dropwise condensation

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