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A computer tool for quick estimations of saturated vapour and liquid molar volumes of pure fluids by cubic equations of state [Elektronski vir]
Oreški, Severina
In the paper a computer tool for calculation of saturated vapour and liquid molar volumes of pure components by different cubic equations of state is presented. The computer program uses a canonical ...form of general equation expressed with the compressibility factor Z which is valid for all cubic equation. All three roots of equation are calculated by the analytical method of auxiliary values. The analytical approach needs no initial values to start the calculation; therefore it is more precise than numerical one. The compressibility for pure saturated liquid and vapour are detected as the smallest and the largest root of the canonical cubic equation. From the saturated compressibility the saturated vapour and liquid molar volumes are calculated. Till now, models for seven popular cubic equations of state are incorporated into the computer program, together with their specific parameters. The calculated values of saturated molar volumes for several pure components estimated by different equations of state are compared with experimental data. In the paper comments are given on the use of different models. The presented computer program will be upgraded into the computer tool for estimation of saturated vapour and liquid volumes of mixtures by cubic and quartic analytical equations of state.
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