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Discussions sur les méthodes de prévision du transfert de chaleur lors de l'évaporation des mélanges CO2-huile dans un tube horizontal lisse.

Discussions on prediction methods of evaporation heat transfer of CO2-oil mixtures in a horizontal smooth tube.

Auteurs : GAO L., SATO M., MATSUSAKA Y., et al.

Résumé

Experiments on flow boiling heat transfer of pure CO2 and CO2-oil (PAG) mixtures in a horizontal smooth tube have been carried out. The test tube is a stainless steel smooth tube, which is 3.76 mm in inner diameter and 1 m in length. Experiments were carried out at mass velocities from 100 to 400 kg/(m2s), a saturation temperature of 10°C, heat fluxes from 10 to 30 kW/m2, and the oil circulation ratios from 0 to 1.01 mass%. The flow patterns were observed and the results were compared with the flow pattern map developed by Cheng et al., and the measured local heat transfer coefficients were compared with the prediction correlations proposed by Cheng et al. As the results, it was found that there is a discrepancy between the observations and the flow pattern map. On flow boiling heat transfer of pure CO2, the heat transfer coefficients estimated using the prediction method agreed with 91% of the experimental data within plus or minus 30% by modifying the flow pattern map. In case of CO2-oil mixtures, the heat transfer coefficients estimated using the prediction method agreed with 81% of experimental data within plus or minus 30% by modifying the nucleate boiling suppression factor.

Documents disponibles

Format PDF

Pages : pp. 561-566

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

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

Détails

  • Titre original : Discussions on prediction methods of evaporation heat transfer of CO2-oil mixtures in a horizontal smooth tube.
  • Identifiant de la fiche : 2010-0728
  • Langues : Anglais
  • Source : ACRA-2009. The proceedings of the 4th Asian conference on refrigeration and air conditioning: May 20-22, 2009, Taipei, R.O.C.
  • Date d'édition : 20/05/2009

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