How coalescing droplets jump

Ryan Enright, Nenad Miljkovic, James Sprittles, Kevin Nolan, Robert Mitchell, Evelyn N. Wang

Research output: Contribution to journalArticle

Abstract

Surface engineering at the nanoscale is a rapidly developing field that promises to impact a range of applications including energy production, water desalination, self-cleaning and anti-icing surfaces, thermal management of electronics, microfluidic platforms, and environmental pollution control. As the area advances, more detailed insights of dynamic wetting interactions on these surfaces are needed. In particular, the coalescence of two or more droplets on ultra-low adhesion surfaces leads to droplet jumping. Here we show, through detailed measurements of jumping droplets during water condensation coupled with numerical simulations of binary droplet coalescence, that this process is fundamentally inefficient with only a small fraction of the available excess surface energy (≲6%) convertible into translational kinetic energy. These findings clarify the role of internal fluid dynamics during the jumping droplet coalescence process and underpin the development of systems that can harness jumping droplets for a wide range of applications.

Original languageEnglish (US)
Pages (from-to)10352-10362
Number of pages11
JournalACS Nano
Volume8
Issue number10
DOIs
StatePublished - Oct 28 2014

Keywords

  • coalescence
  • condensation
  • droplet jumping
  • microfluidics
  • nanostructured surface design
  • superhydrophobic
  • wetting

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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  • Cite this

    Enright, R., Miljkovic, N., Sprittles, J., Nolan, K., Mitchell, R., & Wang, E. N. (2014). How coalescing droplets jump. ACS Nano, 8(10), 10352-10362. https://doi.org/10.1021/nn503643m