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Caractéristiques de transfert de chaleur et méthode de prévision pour le CO2 dans des minitubes horizontaux, lors de la surchauffe.

Post-dryout heat transfer characteristics and prediction method for CO2 in horizontal minitubes.

Auteurs : YUN R., LEE Y., KIM Y.

Résumé

Because of the steep decrease of the flow boiling heat transfer coefficient of CO2 at moderate vapour quality, the post-dryout heat transfer characteristic of CO2 is an important parameter in designing heat exchangers. In this study, the post-dryout heat transfer coefficients were analyzed by dividing two regions based on the observation of the trends of the heat transfer coefficients. One is a transition region, and the other is a fully dryout region. When the Shah model was applied to the heat transfer coefficients of the transition region, the mean deviation between the experimental results and the estimated data was 25.3%. The Groeneveld model was applied to the fully dryout region, yielding the mean deviation of 36.4%. The Groeneveld model is suggested for the post-dryout heat transfer coefficient, and the Yun et al. model is recommended for the pre-dryout heat transfer coefficient. The critical liquid film model was applied to predict the dryout vapour quality in the present model.

Documents disponibles

Format PDF

Pages : ICR07-B1-290

Disponible

  • Prix public

    20 €

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    Gratuit

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Détails

  • Titre original : Post-dryout heat transfer characteristics and prediction method for CO2 in horizontal minitubes.
  • Identifiant de la fiche : 2007-2511
  • Langues : Anglais
  • Source : ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Date d'édition : 21/08/2007

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