Two Empirical Equations of State for Liquids To Improve p, V, T Data Representation and Physical Meaning
| Autor: | Siro Toscani, Henri Szwarc |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Journal of Chemical & Engineering Data. 49:163-172 |
| ISSN: | 1520-5134 0021-9568 |
| Popis: | A previously published four-parameter empirical equation of state of liquids is modified twice in order to improve the p, V, T data representation and its physical meaning, respectively. The first modification, a six-parameter relationship with two pressure square-root terms, was applied to 57 liquid compounds and to 6 mixtures and gives a very good representation (average percentage deviations of specific volume values less than 0.3%) of p, V, T data encompassing large pressure domains (0.1 to 1200 MPa). It could be useful for engineering applications. The second modified relationship exhibits the same fitting characteristics as the four-parameter one, but it has a better physical meaning. This equation contains an adjustable positive coefficient ξ which accounts for the intersections of the (∂α/∂p) T isotherms at high pressure and also for the variations of the pressure coefficient (∂p/∂T) V as a function of both volume and temperature. Thermal expansion data may be represented with an average percentage deviation better than 5%. |
| Databáze: | OpenAIRE |
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