Calculation of thermal pressure coefficient of dense fluids using the linear isotherm regularity

ISRN Physical Chemistry

2012

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For thermodynamic performance to be optimized, particular attention must be paid to the fluid's thermal pressure coefficients and thermodynamics properties. A new analytical expression based on the statistical mechanics is derived for thermal pressure coefficients of dense fluids using the intermolecular forces theory to be valid for liquid lithium as well. The results are used to predict the parameters of some binary mixtures at different compositions and temperatures metal-nonmetal lithium fluid which agreement with experimental data. In this paper, we have used newly presented parameters of analytical expressions based on the statistical mechanics and predicted the metal-nonmetal transition for liquid lithium. The repulsion term of the effective pair potential for lithium shows well depth at 1600 K, and the position of well depth maximum is in agreement with X-ray diffraction and small-angle X-ray scattering.

Section: Fluids (T > T C )mentioning

confidence: 99%

“…Only, pVT experimental data have been used for the calculation of thermal pressure coefficients [16].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Calculation of Thermal Pressure Coefficient of Lithium Fluid by pVT Data

ISRN Physical Chemistry

2012

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“…This is a statement of the principle of corresponding states. The ability of the law to predict experimental behavior is nicely shown in papers, where the reduced quantity is plotted against the reduced density at various reduced temperatures [1,2].…”

Section: Introductionmentioning

confidence: 82%

Determination of Molecular Diameter by PVT

ISRN Physical Chemistry

Deilam

2012

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We derive an equation for calculation of molecular diameter of dense fluids, with using simultaneous Lennard-Jones (12-6) potential function and the internal pressure results. Considering the internal pressure by modeling the average configurational potential energy and then taking its derivative with respect to volume to a minimum point of potential energy has been shown that molecular diameter is function of the resultant of the forces of attraction and the forces of repulsion between the molecules in a fluid. The regularity is tested with experimental data for 10 fluids including Ar, N 2 , CO, CO 2 , CH 4 , C 2 H 6 , C 3 H 8 , C 4 H 10 , C 6 H 6 , and C 6 H 5 CH 3 . These problems have led us to try to establish a function for the accurate calculation of the molecular diameter based on the internal pressure theory for different fluids. The relationship appears to hold both compressed liquids and dense supercritical fluids.

“…Only, pVT experimental data have been used for the calculation of thermal pressure coefficient [18].…”

Section: Introductionmentioning

confidence: 99%

Calculation of Thermal Pressure Coefficient of R11, R13, R14, R22, R23, R32, R41, and R113 Refrigerants by pVT Data

Advances in Physical Chemistry

Farzad

2013

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For thermodynamic performance to be optimized particular attention must be paid to the fluid's thermal pressure coefficients and thermodynamic properties. A new analytical expression based on the statistical mechanics is derived for R11, R13, R14, R22, R23, R32, R41, and R113 refrigerants, using the intermolecular forces theory. In this paper, temperature dependency of the parameters of R11, R13, R14, R22, R23, R32, R41, and R113 refrigerants to calculate thermal pressure coefficients in the form of first order has been developed to second and third orders and their temperature derivatives of new parameters are used to calculate thermal pressure coefficients. These problems have led us to try to establish a function for the accurate calculation of the thermal pressure coefficients of R11, R13, R14, R22, R23, R32, R41, and R113 refrigerants based on statistical-mechanics theory for different refrigerants.