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Nouveau modèle pour la croissance des gouttelettes pendant le début de leur congélation sur des surfaces planes sous convection d’air forcée.

A new model for droplets growth during their onset of freezing on flat surfaces under air forced convection.

Numéro : pap. n. 569

Auteurs : HARGES E., CREMASCHI L., ADANUR B.

Résumé

Frost formation on the fins of outdoor evaporators of heat pump systems degrades system efficiency. Several experimental and theoretical studies investigated using hydrophobic and hydrophilic surface coatings to inhibit frost formation, with promising results; however, most of the models available consist of empirical correlations. This paper presented an update to the droplet condensation and growth portion of the comprehensive, three-stage frost model from Harges and Cremaschi (2018b). The updates include a model for droplet coalescence, which seems to have significant impact on droplets that grow larger than 125 µm. It also includes a new freezing time correlation. With these two updates, the model predictions agreed well with new data of large droplets forming on flat aluminum surfaces at high surface temperature from the present work as well as the data of small droplets on low surface temperatures from previously published studies in the literature.

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Format PDF

Pages : 8

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Détails

  • Titre original : A new model for droplets growth during their onset of freezing on flat surfaces under air forced convection.
  • Identifiant de la fiche : 30026007
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.0569

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