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Two-phase pressure drops in horizontal tubes: new results for R410A and R134a compared to R22.

Chutes de pression diphasiques à l'intérieur de tubes horizontaux : nouveaux résultats pour le R410A et le R134a et comparaison avec le R22.

Résumé

Two-phase flow pressure drops were measured during evaporation and adiabatic conditions for R410A, R134a and R22 at 5 °C inside two plain horizontal tubes for vapour qualities from 2 to 96% and mass velocities from 70 to 500 kg/m2s. Both test sections had an internal diameter of 13.84 mm. The experimental results were compared to three two-phase frictional pressure drop correlations: Friedel, Grönnerud and Müller Steinhagen-Heck. While all three provided partial agreement at some mass velocities, they either significantly overpredicted or underpredicted the data at the other mass velocities and did not reliably capture the trends observed. The new data cover the following flow regimes: stratified-wavy, intermittent, annular, annular with partial dryout and mist flow.

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Détails

  • Titre original : Two-phase pressure drops in horizontal tubes: new results for R410A and R134a compared to R22.
  • Identifiant de la fiche : 2004-1042
  • Langues : Anglais
  • Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Date d'édition : 17/08/2003

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