Roughness-enhanced collection of condensed droplets
| Autor: | Daniel Beysens, Anne Mongruel, Joachim Trosseille, M. G. Medici, Laurent Royon |
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| Přispěvatelé: | Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL), Laboratoire Interdisciplinaire des Energies de Demain (LIED (UMR_8236)), Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut de Physique de Nice (INPHYNI), Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA) |
| Rok vydání: | 2019 |
| Předmět: |
[PHYS]Physics [physics]
Coalescence (physics) Materials science Drop (liquid) Biophysics Nucleation High density Surfaces and Interfaces General Chemistry Surface finish 01 natural sciences 6. Clean water Water collection 010305 fluids & plasmas Chemical physics 0103 physical sciences Surface roughness General Materials Science Dew 010306 general physics Biotechnology |
| Zdroj: | European Physical Journal E: Soft matter and biological physics European Physical Journal E: Soft matter and biological physics, EDP Sciences: EPJ, 2019, 42 (11), ⟨10.1140/epje/i2019-11905-9⟩ |
| ISSN: | 1292-895X 1292-8941 |
| Popis: | International audience; Gravity shedding of droplets is limited by droplet pinning, a major limitation for low condensation processes and in particular passive dew harvesting in its use as an alternative source of water. We present experiments showing that, paradoxically, a simple surface treatment increasing roughness (sand-blasting) favors droplet shedding compared to the original substrate, provided that sand-blasting does not increase too much the surface roughness. Sand-blasting ensure the high density of nucleation sites and enhance the coalescences events at a sub-micron scale, thus lowering the lag-time to obtain drop sliding during condensation. Early nucleation indeed overcompensates the delay increase due to roughness. Edges of the substrate, where drops grow faster, also improve water collection, thank to the early sliding of edge drops that behave as natural wipers. Combining the effects of sand blasting and edges increase significantly the rate of collection of dew condensation on a substrate at a given time, gains of about 30% can be commonly obtained. |
| Databáze: | OpenAIRE |
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