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Utilisation de la mouillabilité des surfaces structurées pour améliorer le transfert de chaleur côté air par le biais de générateurs de tourbillons de gouttelettes d’eau gelées – Partie II: Résultats de la simulation CFD.

Using patterned surface wettability to enhance air-side heat transfer through frozen water droplet vortex generators – Part II: CFD simulation results.

Auteurs : KOOPMAN A. E., SOMMERS A. D., HERMES C. J. L.

Type d'article : Article de la RIF

Résumé

In this study, a novel technique for deploying hemispherical vortex generators (VGs) aimed at heat transfer enhancement via the naturally-occurring processes of condensation and freezing was proposed and investigated. By using patterned surface wettability to collect condensate and encourage coalescence in predetermined locations, it was hypothesized that large frozen droplets could be formed in various configurations which could serve as VGs. This approach was simulated numerically in the present communication (Part II) and examined experimentally in a previous study (Part I). For the CFD simulations, ten different configurations in channel flow emulating a fin density of 5 FPI were investigated. Inlet air velocities of 1.0 and 2.0 m s−1 at 20°C were examined for the flow through the channel where the walls and VGs were set to -9°C to match the experimental conditions used in Part I. The air-side heat transfer coefficient, pressure drop, and temperature changes were then calculated after a converged solution was reached. Compared to a baseline configuration without VGs, heat transfer enhancements ranging from 14.0 to 75.9% were observed, with corresponding pressure drop increases (or penalties) ranging from 35.7 to 165.6%.

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Format PDF

Pages : 737-745

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Détails

  • Titre original : Using patterned surface wettability to enhance air-side heat transfer through frozen water droplet vortex generators – Part II: CFD simulation results.
  • Identifiant de la fiche : 30029179
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 131
  • Date d'édition : 11/2021
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2021.07.034
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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