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Évaluation et visualisation du transfert de chaleur par ébullition en écoulement du CO2 dans un tube cylindrique horizontal avec et sans huile à basses températures.

CO2 flow boiling heat transfer evaluation and visualization in a horizontal round tube with and without oil at low temperatures.

Numéro : 1101

Auteurs : ZHAO H., LI X., TANG K., HATTORI K., MUGABI N., ELBEL S.

Résumé

This paper investigates CO2 flow behavior in a smooth 7.9mm horizontal copper tube with and without oil at low evaporation temperatures (< -10°C). Heat transfer coefficients and pressure drop are measured at different evaporating temperatures, -10°C, -20°C, and -35°C at a mass flux of 150 kg/(s-m2) and heat flux of 5kW/m2. Flow visualization is conducted to study flow regimes. Test results with different oil concentrations in the refrigerant (1% and 5% OCRs) are compared with the performance data without oil. Test results with the low oil concentration of 1% OCR show little impact on both heat transfer and pressure drop in the two-phase flow region compared to the no-oil condition. Increasing oil concentration to 5% OCR leads to large changes in both heat transfer and pressure drop at all temperature conditions. A general trend of increased HTC and pressure drop is observed when compared to the no-oil and 1% OCR conditions.

Documents disponibles

Format PDF

Pages : 9 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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

Détails

  • Titre original : CO2 flow boiling heat transfer evaluation and visualization in a horizontal round tube with and without oil at low temperatures.
  • Identifiant de la fiche : 30032641
  • Langues : Anglais
  • Source : 16th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2024). Proceedings. University of Maryland, College Park, Maryland, USA, August 11-14 2024
  • Date d'édition : 08/2024
  • DOI : http://dx.doi.org/10.18462/iir.gl2024.1101

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