Ballistics of self-jumping microdroplets
- Physique et Mecanique des Milieux Heterogenes, Paris (France); Ecole Polytechnique, Palaiseau (France)
- Stony Brook Univ., Stony Brook, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- 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 Laboratory (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
Web of Science
Energy-based modeling of micro- and nano-droplet jumping upon coalescence on superhydrophobic surfaces
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journal | September 2019 |
‘Sneezing’ plants: pathogen transport via jumping-droplet condensation
|
journal | June 2019 |
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