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Régimes d’écoulement du R-32, du R-1234yf et du R-454C dans des minicanaux et microcanaux multiport horizontaux : développement d’une nouvelle méthode prédictive du régime d’écoulement.

Flow regimes of R32, R1234yf, and R454C in horizontal multiport mini/ micro-channels: Development of a new flow regime prediction method.

Auteurs : NOGAMI T., JIGE D., INOUE N.

Type d'article : Article de la RIF

Résumé

This study investigates the two-phase flow structures of a zeotropic binary refrigerant mixture (R454C) and two pure refrigerants (R32 and R1234yf) in multiport square mini/micro-channels with hydraulic diameters of 0.5 and 1.0 mm. Flow visualization experiments were conducted to examine the effects of the channel size, refrigerant pressure, and thermophysical properties on flow regime transitions. Three primary flow regimes were identified: plug (intermittent), slug-annular, and annular flows. As the hydraulic diameter decreased, the transition boundary from plug flow to slug-annular flow (P/SA) shifted towards higher vapor quality and mass flux, while the transition boundary from slug-annular flow to annular flow (SA/A) moved toward higher values of both parameters. Similarly, the P/SA and SA/A transition boundaries shifted towards slightly higher vapor quality and mass flux as the refrigerant pressure increased. The observed results were compared with existing flow regime maps. A new flow regime map was proposed, incorporating transition boundaries defined by the Weber number, Reynolds number, and confinement number. This new flow regime map achieved a prediction accuracy of 93.9 %. The accuracy of the flow regime maps was validated using previously reported data for different hydraulic diameter, refrigerants, and saturation pressures.

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Pages : 12 p.

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Détails

  • Titre original : Flow regimes of R32, R1234yf, and R454C in horizontal multiport mini/ micro-channels: Development of a new flow regime prediction method.
  • Identifiant de la fiche : 30034357
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 179
  • Date d'édition : 11/2025
  • DOI : http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2025.08.015

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