Reduction into a rational fraction of a thermodynamic property of the liquid state: Experimental determinations in the case of CO2 and <i>n</i>-butane. Extension to the other properties

Alba, C.; Minassian, L. Ter; Denis, Armelle; Soulard, Alain

doi:10.1063/1.448757

Cited by 48 publications

(32 citation statements)

References 13 publications

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“…Alba et al 23 confirmed the validity of eq 1, with y = (-1/2), through a statistical analysis of the experimental ap isotherms of carbon dioxide and n-butane from the triple temperature to the critical temperature and pressures up to 400 MPa. It is now interesting to bring out the experimental evidence of the existence of a crossover of the isotherms of ap for a large number of liquids of very different nature>J7,23-2* It has also been observed that when such intersections are found, they occur in a very narrow range of pressures for many liq~ids.l~-~~,26 Under the following conditions: (a) the intersection of the ap isotherms Occurs at a single point of the @,ap) plane, (b) the spinodal curve originates at the critical point, and (c) the locus of the spinodal in (p,T) coordinates can be described by a [1/1] Pad6 approximation, Alba et al proposed the following expression for ap as a function of pressure p and temperature T 2 3…”

Section: Phenomenological and Theoretical Backgroundmentioning

confidence: 78%

Estimation of the Spinodal Curve for Liquids: Application to 2,3-Dimethylbutane

Baonza¹,

Alonso²,

Delgado³

1994

J. Phys. Chem.

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For a pure substance, the spinodal curve is defined as the locus where thermodynamic quantities such as the thermal expansion coefficient a,, the isothermal compressibility KT, and the isobaric heat capacity C, are expected to diverge. Its location is of particular importance from both practical and theoretical points of view, since it represents the limit beyond which a particular state of matter, in our case the liquid state, can exist or not. In this work, several predictions of the spinodal curve have been tested, compared, and discussed for 2,3-dimethylbutane. Thecomparison with results found in the literature reveals that some conclusions established here could be of general application.

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Section: Phenomenological and Theoretical Backgroundmentioning

confidence: 78%

Estimation of the Spinodal Curve for Liquids: Application to 2,3-Dimethylbutane

Baonza¹,

Alonso²,

Delgado³

1994

J. Phys. Chem.

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“…The crossover of the thermal expansivity isotherms seems to be a universal property of liquids. A general observation has been that such intersections usually occur at pressures below 200 MPa [12]. Hexane and chloroform are choosen because accurate experimental data have been reported in case of these liquids for the pressure density relationship, thermal expansivity vs. pressure and temperature, and isothermal compressibility for a wide range of pressures and temperatures.…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermal expansivity and isothermal compressibility of liquid hexane and chloroform

Chauhan

Singh

2011

Indian J Phys

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In the present paper, we have analysed the pressure dependences of thermal expansivity (a p ) and isothermal compressibility (K T ) for the liquid hexane and chloroform. We have used the formulae based on the pseudospinodal model and the Sanchez et al [1,2] equation of state obtained from the Pade approximation. The thermal expansion coefficient and isothermal compressibility follow a power law function of pressures. It is found that the quantities, a p as well as K T decreases with the increasing pressure. The isothermal compressibility decreases more rapidly in comparison to thermal expansivity. The pressure at which the spinodal condition is satisfied, i.e. a p and K T both tend to infinity, has been found to be a characteristic property of the liquid hexane and chloroform.

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“…The minima of the isobaric heat capacity on the isotherms is observed in both simple and complex liquids, such as liquid carbon dioxide and n-butane, 33 hexane, 34 methane, 35 quinolone, 36 and coal-derived liquids. 37,38 It was found that there is a crossing point in isobaric thermal expansion coefficients along the isothermal lines in all of these systems.…”

Section: Discussionmentioning

confidence: 99%

Thermodynamic properties of liquid sodium under high pressure

Zhang

Sun

et al. 2017

AIP Advances

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Acquiring reliable thermodynamic properties in liquid metals at high pressure and temperature is still a challenge in both experiment and theory. Equation of state (EoS) offers an alternative approach free of many of the difficulties. Here using the EoS of a power law form we obtained the thermodynamic properties of liquid sodium under pressure along the isothermal lines, including isothermal buck modulus, thermal expansion coefficient, Grüneisen parameter, and Anderson-Grüneisen parameter. The results are in excellent agreement with available experimental data measured by a piezometer at high temperature and high pressure and sound velocity measurement with pulse-echo technique. We found that the pressure derivative of the isothermal bulk modulus at zero pressure is a monotonic function of temperature and has a value around 4. In addition, unexpected crossing points were found in the isobaric thermal expansion coefficient and Grüneisen parameter; and a minimum in the isobaric heat under isothermal compression was also observed. While some of these detailed predictions are yet to be confirmed by further experiment, our results suggest that the power law form may be a more suitable choice for the EoS of liquids metals.

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Reduction into a rational fraction of a thermodynamic property of the liquid state: Experimental determinations in the case of CO2 and n-butane. Extension to the other properties

Cited by 48 publications

References 13 publications

Estimation of the Spinodal Curve for Liquids: Application to 2,3-Dimethylbutane

Estimation of the Spinodal Curve for Liquids: Application to 2,3-Dimethylbutane

Analysis of thermal expansivity and isothermal compressibility of liquid hexane and chloroform

Thermodynamic properties of liquid sodium under high pressure

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