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Title: Ballistics of self-jumping microdroplets

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1496573
Alternate Identifier(s):
OSTI ID: 1489731
Report Number(s):
BNL-211289-2019-JAAM
Journal ID: ISSN 2469-990X
Grant/Contract Number:  
SC0012704; AC02-98CH10886
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Fluids
Additional Journal Information:
Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2469-990X
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY AND ECONOMY

Citation Formats

Lecointre, Pierre, Mouterde, Timothée, Checco, Antonio, Black, Charles T., Rahman, Atikur, Clanet, Christophe, and Quéré, David. Ballistics of self-jumping microdroplets. United States: N. p., 2019. Web. doi:10.1103/PhysRevFluids.4.013601.
Lecointre, Pierre, Mouterde, Timothée, Checco, Antonio, Black, Charles T., Rahman, Atikur, Clanet, Christophe, & Quéré, David. Ballistics of self-jumping microdroplets. United States. doi:10.1103/PhysRevFluids.4.013601.
Lecointre, Pierre, Mouterde, Timothée, Checco, Antonio, Black, Charles T., Rahman, Atikur, Clanet, Christophe, and Quéré, David. Mon . "Ballistics of self-jumping microdroplets". United States. doi:10.1103/PhysRevFluids.4.013601.
@article{osti_1496573,
title = {Ballistics of self-jumping microdroplets},
author = {Lecointre, Pierre and Mouterde, Timothée and Checco, Antonio and Black, Charles T. and Rahman, Atikur and Clanet, Christophe and Quéré, David},
abstractNote = {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.},
doi = {10.1103/PhysRevFluids.4.013601},
journal = {Physical Review Fluids},
number = 1,
volume = 4,
place = {United States},
year = {2019},
month = {1}
}

Journal Article:
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