| Title |
Performance of Short Tube Orifices UsingR-410A Near the Critical Region |
| Keywords |
Short tube orifice ; 오리피스 ; Critical region ; 임계영역 ; Flow model ; 유량모델 ; Mass flow rate ; 질량유량 |
| Abstract |
An experimental investigation was performed to develop an empirical correla-tion of R-410A flowing through short tube orifices working near the critical region. Tests were executed by varying upstream pressure from 2,619kPa to 4,551kPa, and upstream sub-cooling from 2.8 and 11.1℃. The experimental data were represented as a function of major operating parameters and short tube diameter. As compared to mass flow trends at normal upstream pressures, flow dependency on upstream subcooling became more significant at high upstream pressures due to a higher density change. Based on the database obtained from this study and literature, an empirical correlation was developed from a power law form of dimen-sionless parameters generated by the Buckingham Pi theorem. The correlation yielded good agreement with the data. Approximately 92% of the data were correlated within a relative de-viation of 5%. |