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Waring and Riedel Functions for the Liquid-Vapor Coexistence Curve

Velasco, Santiago and White, Juan A and Srinivasan, Kandadai and Dutta, Pradip (2012) Waring and Riedel Functions for the Liquid-Vapor Coexistence Curve. In: Industrial & Engineering Chemistry Research, 51 (7). pp. 3197-3202.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ie2028393

Abstract

There exists a minimum in the Waring function, psi(T) = -d(ln p)/d(1/T), and in the Riedel function, alpha(T) = d(ln p)/d(In T), in the liquid-vapor coexistence curve for most fluids. By analyzing National Institute of Standards and Technology data for the molar enthalpy of vaporization and the compressibility variation at the liquid-vapor phase change of 105 fluids, we find that the temperatures of these minima are linearly correlated with the critical temperature, T-c. Using reduced coordinates, we also demonstrate that the minima are well-correlated with the acentric factor. These correlations are used for testing four well-known vapor pressure equations in the Pitzer corresponding states scheme.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 10 Apr 2012 07:34
Last Modified: 10 Apr 2012 07:34
URI: http://eprints.iisc.ernet.in/id/eprint/44165

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