69th Annual Meeting of the APS Division of Fluid Dynamics (November 20, 2016 — November 22, 2016)

V0094: Droplets on point

  • Ben Lovett, Utah State University
  • Andrew Merritt, Utah State University
  • Nathan Speirs, Utah State University
  • Tadd Truscott, Utah State University
DOI: https://doi.org/10.1103/APS.DFD.2016.GFM.V0094

A droplet impinging a hydrophobic surface (low We) spreads to a maximum diameter before retracting to the center of impact and sometimes lifting off. If the impact surface is augmented by a small ridge, the droplet will often split at this surface feature upon spreading resulting in a shorter time to lift off (Bird et. al., Nature503, 2013). We investigate how a singular feature (needle point) generates a similar reduction in droplet contact time. Droplets impact hydrophobic needles at several impact velocities. While it was initially supposed that splitting the droplet into more pieces would further decrease contact time, this was not observed. Rather, the spreading event at the center of the droplet has a greater effect on contact time.


This work is licensed under the Creative Commons Attribution-NonCommercial 4.0 International License. Any reuse must credit the author(s) and provide a link back to this page.