EQUATION OF STATE FOR SOLID CARBON DIOXIDE IN FORM OF THE GIBBS FREE ENERGY
We established a fundamental equation of state explicit in the Gibbs free energy, which was fitted to experimental data (heat capacity, molar volume, expansion coefficient and compressibility) of solid carbon dioxide. Almost all of the data the equation was fitted to are represented within the experimental uncertainty given by the authors. However, only very limited data for thermodynamic properties of solid carbon dioxide are available. The new equation still shows reasonable physical behavior within its range of validity. Sublimation and melting pressures of dry ice can be predicted using Gibbs enthalpies calculated from the new dry ice equation and from the fundamental equation by Span and Wagner (1996) for the fluid phase. The results agree with those of the reference equations for sublimation and melting pressure pulished by Span und Wagner (1996) mostly within the uncertainty claimed for these equations. The resulting sublimation and melting pressures are very sensitive to variations of the Gibbs enthalpy. If another equation of state is used for the fluid phase, this has a significant impact on the calculated equilibrium pressures.
Andreas J(a)ger Roland Span
Thermodynamics Ruhr-Universitaet Bochum 44801 Bochum, Germany
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
1174-1180
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）