Choked Flow Characteristics of Subcritical Refrigerant Flowing Through Converging-Diverging Nozzles
| Autor: | Yanhua Chen, Lirui Tong, Zhenying Zhang, Lili Tian |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Pressure drop
critical mass flow rate Materials science nozzle Mass flow meter Nozzle Isothermal flow General Physics and Astronomy Thermodynamics lcsh:Astrophysics refrigeration system lcsh:QC1-999 Subcooling choked flow lcsh:QB460-466 Mass flow rate lcsh:Q Total pressure lcsh:Science Choked flow lcsh:Physics |
| Zdroj: | Entropy Volume 16 Issue 11 Pages 5810-5821 Entropy, Vol 16, Iss 11, Pp 5810-5821 (2014) |
| ISSN: | 1099-4300 |
| DOI: | 10.3390/e16115810 |
| Popis: | This paper presents the experimental results the choked flow characteristics of a subcritical refrigerant through a converging-diverging nozzle. A test nozzle with a throat diameter of 2 mm was designed and developed. The influence of operating conditions on the choked flow characteristics, i.e., the pressure profile and mass flow rate under choked flow conditions are investigated. The results indicate that the choked flow occurs in the flow of subcritical refrigerant through nozzles under the normal working conditions of air-conditioners or heat pumps. The pressure drop near the throat is about 80% of the total pressure drop through the nozzle. The critical mass flux is about 19,800 ~ 24,000 kg/(s·m2). The critical mass flow rate increases with increasing the upstream pressure and subcooling. Furthermore, the relative errors between the model predictions and the experimental results for the critical mass flux are also presented. It is found that the deviations of the predictions for homogeneous equilibrium model and Henry-Fauske model from the experimental values are −35% ~ 5% and 15% ~ 35%, respectively |
| Databáze: | OpenAIRE |
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