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Document IIF

Transfert de chaleur lors de l'ébullition et chute de pression d'un frigorigène s'écoulant verticalement vers le bas dans un petit tube rectangulaire.

Boiling heat transfer and pressure drop of a refrigerant flowing vertically downward in a small rectangular tube.

Auteurs : MIYATA K., MORI H., OHISHI K., et al.

Résumé

Experiments were performed on flow boiling heat transfer and two-phase pressure drop of a refrigerant R410A flowing downward in a vertical small copper rectangular tube with 1.04 mm inside hydraulic equivalent diameter for the development of a high-performance heat exchanger using small tubes or multi-port extruded tubes for air conditioning systems. Local heat transfer coefficients were measured in a range of mass velocities from 30 to 200 kg/m2.s, heat fluxes from 1 to 16 kW/m2 and qualities from 0.05 to 1 at the evaporation temperature of 10°C. Pressure drops were also measured at mass velocities from 30 to 200 kg/m2.s and qualities from 0.1 to 0.9 at the saturation temperature of 10°C under the adiabatic condition. The characteristics of frictional pressure drop, heat transfer coefficient and dry-out quality were clarified by comparing the measurements with the data for the circular tube of 1.00 mm inside diameter previously obtained.

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Format PDF

Pages : 2009-5

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    20 €

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    Gratuit

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Détails

  • Titre original : Boiling heat transfer and pressure drop of a refrigerant flowing vertically downward in a small rectangular tube.
  • Identifiant de la fiche : 2009-1959
  • Langues : Anglais
  • Source : 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Date d'édition : 23/06/2009

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