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Description of state behavior along the critical isotherm and along the saturation curve using simple equations of state. Part II
Bayer, Zdeněk
The contribution deals with a group of 13 equations of state (EOS), predominantly of the van der Waals type, both classical and also newly developed in the IT AS ČR. In the region from the triple- to the critical points, the changes in the temperature functions (1st criterion), deviations of the derivate from the correct value, (2nd criterion), and the course of the liquid spinodal are investigated. Ordinary water substance is used as the model medium. The data and/or equations following from the critical point and saturation curve conditions are given. The calculations showed that considerable improvements may be arrived at separately applied criteria but at their simultaneous application the improvement has been not gained.
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Description of state behavior along the critical isotherm and along the saturation curve using simple equations of state ů part I
Bayer, Zdeněk
The contribution deals with a group of 13 equations of state (EOS), predominantly of the van der Waals type, both classical and also newly developed in the Institute. In the region from the triple- to the critical points, the changes in the temperature functions (1st criterion), deviations of the derivate (2nd criterion), and the course of the liquid spinodal are investigated. Ordinary water substance is used as the model medium. The possibilities of improving EOS of this type are searched. While at separately applied criteria some improvements were arrived at, the simultaneous application of criteria gave no satisfactory results.
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Analysis and development of comparatively simple algebraic equations of state
Bayer, Zdeněk
The survey of until now analysis of various types of simple equations of state (EOS) is given. A method was developed and used for consecutive testing of algebraic EOS, EOS with terms with fractional exponents, EOS with exponential and also theirs combination. Several new two-and three-constant cubic EOS of the van der Waals type was shown that should be more universal than the other EOS.
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