Document IIF

Analyse de l’épaisseur du givre et de l’intensification de sa rugosité du point de vue de la structure du cristal de givre.

Analysis of frost thickness and roughness growth from the perspective of frost crystal structure.

Auteurs : ZHANG T., O'NEIL D. L., MCCLAIN S. T.

Type d'article : Article de la RIF

Résumé

Laboratory experiments were conducted to characterize frost thickness and roughness on a horizontal cold flat surface with respect to the type of frost crystal. Air velocities, free stream temperatures, wall temperatures, and relative humidities were varied from 0.5 to 1.5 m s−1, 16 to 6°C, and -25 to −15°C, and 50 to 75%, respectively. Three-dimensional photogrammetry was employed for evaluating frost roughness characteristics. The results showed that the frost growth corresponded with changes of frost crystal formation. Feather and needle crystals created a thick and porous layer with a rough surface, while flake and irregular crystals formed a thin and dense frost layer with a relatively smooth surface. Frost root-mean-square height began to decrease sooner under higher air velocities, higher air temperatures, and higher wall temperatures. The maximum value of frost root-mean-square height was largest under lower air velocities, lower air temperatures, lower wall temperatures, and higher relative humidities. Larger frost surface skewness occurred under lower air velocities, lower air temperatures, higher wall temperatures, and higher relative humidities. The impacts of increasing relative humidity on the frost roughness parameters plateaued at higher relative humidities.

Documents disponibles

Format PDF

Pages : 314-323

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Analysis of frost thickness and roughness growth from the perspective of frost crystal structure.
  • Identifiant de la fiche : 30027404
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 112
  • Date d'édition : 04/2020
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2019.12.019

Liens


Voir d'autres articles du même numéro (30)
Voir la source