Infrared Spectral Emissivity Dynamics of Surfaces Under Water Condensation
Abstract: Water condensation on a surface strongly affects its effective emissivity, especially in the atmospheric window, a wavelength range essential for outdoor applications related to energetically passive cooling and heating. The evolution of emissivity of a silicon surface during dropwise and filmwise water deposition is studied. The evolution of the spectral radiative properties shows that the increase in effective emissivity due to the growth of a droplet pattern is steeper than for a growing water film of equivalent thickness. The change of surface emissivity takes place in the first moments of condensation where droplets as small as 10 µm drastically impact the reflectance of the pristine surface. The upper limit of effective emissivity is reached for a droplet radius or film thickness of 50 µm. During dropwise condensation, effective emissivity is weighted by the drop surface coverage and then remains within an asymptotic maximum value of 0.8, while in case of filmwise condensation, it is shown to reach 0.9 corresponding to water emissivity. Micrometer‐scale spatially‐resolved infrared spectral images enable to correlate the spatial variation of spectral properties to the droplet size and localization. Such findings are of interest to the implementation of moisture‐controlled emissivity tuning and radiative sky‐coolers for dew harvesting.
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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Infrared Spectral Emissivity Dynamics of Surfaces Under Water Condensation ; day:21 ; month:05 ; year:2024 ; extent:11
Advanced functional materials ; (21.05.2024) (gesamt 11)
- Creator
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Lavielle, Nicolas
Othman, Ahmed M.
Hervé, Armande
Hamaoui, Georges
Fei, Jipeng
Tan, Jun Yan
Marty, Frédéric
Li, Hong
Mongruel, Anne
Beysens, Daniel
Nefzaoui, Elyes
Bourouina, Tarik
- DOI
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10.1002/adfm.202403316
- URN
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urn:nbn:de:101:1-2405221418281.781942639793
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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14.08.2025, 11:00 AM CEST
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- Lavielle, Nicolas
- Othman, Ahmed M.
- Hervé, Armande
- Hamaoui, Georges
- Fei, Jipeng
- Tan, Jun Yan
- Marty, Frédéric
- Li, Hong
- Mongruel, Anne
- Beysens, Daniel
- Nefzaoui, Elyes
- Bourouina, Tarik
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