Two-constant equation of state for accurate prediction of the Joule - Thomson inversion curve for air in cryogenic applications
✍ Scribed by Y.S.H. Najjar; M.H. Al-Beirutty; M.S. Ismail
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 426 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
One of the most important applications of cryogenics is the separation and purification of air into its various components. Furthermore, of the many basic processes by which low temperatures are attained, the most commonly used in practical refrigerators is the Joule-Thomson expansion process. In this work the J-T inversion curve is predicted and compared with experimental data for air. Many equations of state such as VDW, RK, SRK and PR fail to obtain accurate prediction. Therefore, using numerical analysis, a simple two-constant equation of state is developed, which gives very favourable comparison with experiment, namely 2% maximum error in predicting thermodynamic properties, and 0.18 as average standard deviation for the J-T curve.