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Title: Ballistics of self-jumping microdroplets

Journal Article · · Physical Review Fluids
 [1];  [1];  [2];  [3];  [4];  [1];  [1]
  1. Physique et Mecanique des Milieux Heterogenes, Paris (France); Ecole Polytechnique, Palaiseau (France)
  2. Stony Brook Univ., Stony Brook, NY (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Indian Institute of Science Education and Research (IISER)-Pune, Maharashtra (India)

Water-repellent materials ideally operate at very different liquid scales: from centimeter-size for bugs living on ponds through millimeter-size for antirain functions to micrometer-size for antifogging solids. In the last situation, it was recently evidenced that microdrops condensing on a highly nonadhesive substrate can take advantage from coalescence to jump off the material, even if the dynamical characteristics of the jump were not established at such microscales. We demonstrate in this paper that the jumping speed of drops is nonmonotonic with the drop size, showing a maximum around 5μm (a size commonly observed in dew), below and above which viscous and inertial effects, respectively, impede the takeoff. We quantitatively describe this optimum in antifogging. Here, we also studied the ballistics of the jumping microdrops, from the height they reached to their behavior at landing; a situation where retakeoff is surprisingly found to be nearly unachievable despite the extreme nonwettability of the material.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; AC02-98CH10886
OSTI ID:
1496573
Alternate ID(s):
OSTI ID: 1489731
Report Number(s):
BNL-211289-2019-JAAM
Journal Information:
Physical Review Fluids, Vol. 4, Issue 1; ISSN 2469-990X
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (2)

Energy-based modeling of micro- and nano-droplet jumping upon coalescence on superhydrophobic surfaces journal September 2019
‘Sneezing’ plants: pathogen transport via jumping-droplet condensation journal June 2019

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