Thermodynamics of pure dipolar fluids. 1. The water and ammonia cases

Article Abstract:

A molecular-based equation of state derived from perturbation theory is used to study the phase diagram and thermodynamic properties of water and ammonia in the fluid phase region. It is shown that by using a higher value of the dipolar moment strength, it is possible to reproduce the phase diagram and other thermodynamic properties, within the same accuracy obtained by associating fluid approaches derived from the Wertheim perturbation theory.

Nitrogenous Fertilizer Manufacturing, Nitrogenous fertilizers, Ammonia, Analysis, Usage, Properties, Perturbation (Mathematics), Thermodynamic potentials

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Phase diagrams and speed of sound for fluids of polar molecules with tetrahedral symmetry

Article Abstract:

A theoretical equation of state for fluids, modeled by a square well with an embedded point tetrahedral octopole is applied to predict the behavior of real substances. It is found that the octopolar square-well theoretical equation of state (OSWTEOS) is able to describe the vapor-liquid phase diagrams for CH4 and CF4 with high precision, except in the critical region.

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Theoretical equation of state of dense nonconformal fluids from effective potentials.1. Applications to model systems

Article Abstract:

The approximate nonconformal (ANC) theory, successfully applied to dilute gases, is generalized to dense fluids. The ANC theory provides closed form equation of state (EOS) for dense fluids, which are in good agreement with simulation results and that allow us to predict the pressure at supercritical states.

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