| Titre : |
Coatings to prevent frost |
| Type de document : |
texte imprimé |
| Auteurs : |
Ricardo Losada, Auteur ; Stefan Holberg, Auteur ; Jeanette M. D. Bennedsen, Auteur ; Klavs Kamuk, Auteur ; Finn Nielsen, Auteur |
| Année de publication : |
2016 |
| Article en page(s) : |
p. 645-653 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Hydrophobie
Revêtements antigel
Sol-gel, Procédé
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The ability of hydrophobic, organic–inorganic hybrid coatings to decelerate frost propagation was investigated. Compared to a bare aluminum surface, the coatings do not significantly reduce the freezing probability of supercooled water drops. On both surfaces, the probability for ice nucleation at temperatures just below 0°C, for example at −4°C, is low. Freezing of a single drop on aluminum leads, however, to instant freezing of the complete surface. On hydrophobic coatings, such a freezing drop is isolated; the frozen area grows slowly. At −4°C surface temperature in a +12°C/90% relative humidity environment, on surfaces providing a water contact angle hysteresis of about 10° and receding water contact angles higher than 90°, a rate for the growth of the average radius of the frozen area of about 2 µm/s was observed. Submitting the surface to an airflow of 1 m/s led to faster frost spreading in flow direction. Although the airflow compromised the anti-ice properties to some extent, the application of the hydrophobic coating in a heat recovery ventilation experiment extended the time interval between defrosting cycles by a factor of 2.3. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Contact angles - Differential scanning calorimetry (DSC) - Ice test chamber - HRV test
- RESULTS AND DISCUSSION : Freezing delay/probability of the first ice nucleation - Frost spreading - Evaluation on a heat exchanger |
| DOI : |
10.1007/s11998-016-9809-1 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9809-1.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26745 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 4 (07/2016) . - p. 645-653
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