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Résumé
Heat transfer and pressure drop characteristics of CO2 are substantially different from those for CFC and HCFC refrigerants. In addition, geometric effects on two-phase flow patterns of CO2 are also very significant in many respects. Therefore, it is very important to ascertain the two-phase flow patterns of CO2 in a narrow rectangular channel or a small diameter tube whose gap size or hydraulic diameter is less than 2 mm in order to understand heat transfer characteristics and to develop an appropriate heat transfer correlation. In the study, the evaporation processes of CO2 in a narrow rectangular channel are visualized at various test conditions, and then the effects of operating conditions are analysed. Based on the test results, a flow pattern map is developed and compared with the existing maps and with flow pattern transition criteria.
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Détails
- Titre original : Two-phase flow patterns of CO2 in a narrow rectangular channel.
- Identifiant de la fiche : 2004-2115
- Langues : Anglais
- Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
- Date d'édition : 17/08/2003
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