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Caractéristiques et stabilité d'un film d'eau en surfusion entraîné par le vent sur une surface glacée. II. Transition et transfert de chaleur turbulente.

Character and stability of a wind-driven supercooled water film on an icing surface. II. Transition and turbulent heat transfer.

Auteurs : KAREV A. R., FARZANEH M., LOZOWSKI E. P.

Type d'article : Article

Résumé

The problem of the appearance and disappearance of the thin water film flowing over an accreting ice surface is reformulated as a problem of the flow dynamics of this water film, taking into consideration both laminar and turbulent heat transfer from the ice/water interface. By comparing the different responses of the rate of ice growth in the supercooled flowing water film, to sudden disturbances in the film thickness, for both laminar and turbulent heat transfer regimes, a new explanation is offered for "wet" and "dry" icing regimes. This explanation is an improvement over the existing one, which is based on macroscopic heat balance considerations. The authors' solution considers a microscopic heat balance analysis, related to the kinetics of crystal growth, and allows for a finite supercooling at the ice/water interface, relative to the fusion temperature of water. In the paper, the kinetics of freezing of a supercooled water film flowing over an icing surface are examined in relation to turbulent heat transfer through the water film. The occurrence of turbulence in the supercooled water film is found to be the determining factor contributing to its stability during freezing under fluctuating external thermodynamic conditions (see also this Bulletin, reference 2004 - 2650).

Détails

  • Titre original : Character and stability of a wind-driven supercooled water film on an icing surface. II. Transition and turbulent heat transfer.
  • Identifiant de la fiche : 2004-2651
  • Langues : Anglais
  • Source : International Journal of thermal Sciences - vol. 42 - n. 5
  • Date d'édition : 05/2003

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