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Influence de la taille du tube et de l'huile sur le développement d'un écoulement diphasique adiabatique.

Effect of tube size and oil on developing adiabatic two-phase flow.

Numéro : 2346

Auteurs : YAO Y., HRNJAK P.

Résumé

It is well known that the developed two-phase flow is determined by the working conditions, tube size, and working media. For the developing two-phase flow, it is also affected by these factors. However, there are only a few studies about developing two-phase flow in the open literature. In this paper, the authors will compare the developing adiabatic two-phase flow after a thermostatic expansion valve in a 5 mm and an 8 mm tube to check the effect of tube size. The experiments are conducted in a real AC system with R134a and 1.3% POE 32 as the working medium. A previous study in the Hrnjak research group at the University of Illinois has investigated the developing two-phase flow of pure refrigerant after a needle valve. By comparing the results in current research with Bowers and Hrnjak (2009), it is possible to learn more about the effect of oil on developing two-phase flow. The authors found that the flow patterns near the expansion device are affected by both the addition of oil and the inner structure of the valve. When the flow is fully developed, the effect of the expansion device is negligible and the difference in flow pattern is mainly caused by oil. The developed flow pattern map with refrigerant and oil mixture in this paper is also compared with Wojtan et al. (2005) and Barbieri et al. (2008) flow pattern map to investigate the effect of oil on developed two-phase flow.

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Pages : 10 p.

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Détails

  • Titre original : Effect of tube size and oil on developing adiabatic two-phase flow.
  • Identifiant de la fiche : 30030684
  • Langues : Anglais
  • Sujet : Technologie
  • Source : 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 2022

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