Equation of state with quantum effects for square-well chain fluid with variable range
Some components with small molecular weight like helium,hydrogen and so on often exhibit significant quantum effects in the regions with low temperature and high density,which are difficult to accurately describe by the classical molecular thermodynamics models.To obtain a reliable model for this type fluid,the de Broglie wavelength was employed to characterize the quantum effects in this work.Based on the statistical associated fluid theory(SAFT),a novel molecular thermodynamic model(QSWCF-VR)that can accurately represent the phase behavior of fluids with quantum effects was then proposed through modifying the square-well width of the classical square-well potential with de Broglie wavelength.The presented model can be used for describing the thermodynamic properties of both conventional fluids and quantum-effect fluids.Based on the saturated vapor-liquid equilibrium experimental data of helium,hydrogen,deuterium,and neon,their molecular parameters characterizing the properties of each pure fluid are obtained,and their phase equilibrium,PVT curves and critical properties are then successfully predicted.The study will provide a theoretical support for the description of the thermodynamic properties of quantum-effect fluids.
equation of statequantum effectssquare-well potentialphase equilibrium
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维普
