Representation and Validation of Liquid Densities for Pure Compounds and Mixtures

Diky, Vladimir; O’Connell, John P.; Abildskov, Jens; Kroenlein, Kenneth G.; Frenkel, Michael

doi:10.1021/acs.jced.5b00477

Cited by 8 publications

(6 citation statements)

References 41 publications

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“…This motivated the efforts reported in this paper to measure the liquid-phase speed of sound for difluoromethane. Additionally, an examination of the NIST Thermodynamics Research Center tool ThermoPlan indicated that limited liquid-phase speed of sound and vapor-phase density data of difluoromethane are reported in the literature. − Thus, vapor-phase density measurements were also completed and are presented in this paper. Figure shows the range of conditions investigated in this paper (solid green circles) and by previous literature studies.…”

Section: Introductionmentioning

confidence: 99%

Liquid-Phase Speed of Sound and Vapor-Phase Density of Difluoromethane

2022

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Difluoromethane (HFC-32, DFM), with a global warming potential (GWP) of 677, is of interest as a pure refrigerant and as a component in low-GWP refrigerant mixtures. Additionally, difluoromethane has recently been identified as a safe, liquefied-gas electrolyte material in batteries. Using state-of-the-art instruments for measurements, this paper presents new liquid-phase speed of sound and vapor-phase density data for difluoromethane. Two hundred and nine liquid-phase speed of sound values were measured using a dual-path pulse-echo instrument at temperatures from 230 to 345 K and pressures from 2.1 to 70 MPa. Accounting for all sources of uncertainty, the relative expanded combined uncertainty (k = 2) in the speed of sound ranged from 0.035 to 0.17%. One hundred and thirty-eight vapor-phase density values were measured using a two-sinker densimeter at temperatures from 240 to 340 K and pressures from 0.1 to 1.61 MPa with an uncertainty of 0.011 to 0.12%. These experimental data will be valuable in the ongoing development of a new fundamental thermodynamic equation of state for difluoromethane.

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Section: Introductionmentioning

confidence: 99%

Liquid-Phase Speed of Sound and Vapor-Phase Density of Difluoromethane

2022

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“…The temperature dependences of the derivative (𝜕𝑉 /𝜕𝑇 ) 𝑃 along the isobars can be obtained, for example, as follows. First, using the Tait equation [27], the pressure dependences of the liquid phase density 𝜌 along a successive equidistant set of isotherms with an endpoint on the liquid-vapor equilibrium curve are calculated. Afterward, a transition from isotherms to isobars is carried out in the 𝑇 − 𝑃 plane.…”

Section: Calculation Techniquementioning

confidence: 99%

Вплив температури та тиску на термодинамічний коефіцієнт (∂V/∂T)p води

Булавин

Rudnikov

2023

Ukr. J. Phys.

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На основi лiтературних даних проведено розрахунки та аналiз температурних i баричних залежностей термодинамiчного коефiцiєнта (∂V/∂T)P для води у станi рiдини. Проведено порiвняння вказаного коефiцiєнта для води та аргону. З урахуванням принципу вiдповiдних станiв пiдтверджено iснування областi термодинамiчної подiбностi мiж водою та аргоном. При цьому iснує область, в якiй зазначена подiбнiсть мiж водою та аргоном не спостерiгається i наявна особлива поведiнка термодинамiчних властивостей води. Так, у води крива температурної залежностi (∂V/∂T)P уздовж лiнiї рiвноваги рiдина–пара має точку перегину за температури (91,0 ± 0,2)∘C, чого не спостерiгається в аргонi. Iснування для води точки перегину кривої (∂V/∂T)P приводить до вiд’ємних значень (∂V/∂T)P при температурах, нижчих 3,98∘C. Крiм того, наявнiсть точки перегину на вказанiй температурнiй залежностi приводить до перетину температурних залежностей сiмейства iзобар (∂V/∂T)P у водi при температурi (42, 0 ± 0, 2)∘C. На вiдмiну вiд цього, кривi температурної залежностi (∂V/∂T)P аргону уздовж лiнiї рiвноваги рiдина–пара не мають вiдповiдної точки перегину.

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“…These, more general relationships, have been used for validating both theoretical and experimental measurements of pressure in mixtures of various liquids 85 .…”

Section: Connection To Experimentsmentioning

confidence: 99%

Can approximate integral equation theories accurately predict solvation thermodynamics?

Misin

2017

Preprint

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Department of Physics Doctor of PhilosophyCan approximate integral equation theories accurately predict solvation thermodynamics? by Maksim MisinThe thesis focuses on the prediction of solvation thermodynamics using integral equation theories. Our main goal is to improve the approach using a rational correction. We achieve it by extending recently introduced pressure correction, and rationalizing it in the context of solvation entropy. The improved model (to which we refer as advanced pressure correction) is rather universal. It can accurately predict solvation free energies in water at both ambient and non-ambient temperatures, is capable of addressing ionic solutes and salt solutions, and can be extended to non-aqueous systems. The developed approach can be used to model processes in biological systems, as well as to extend related theoretical models further.First of all, I would like to thank my supervisors, Prof. Maxim V. Fedorov and Dr. David S. Palmer, who made this Ph.D. an amazing experience. They offered me guidance and support, helping me not only to start but also to finish this project. I would like to acknowledge two visiting students Petteri A. Vainikka, and Samuel W. Coles, who turned out to be wonderful collaborators. Various Strathclyde postgraduate students: Ivor

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Representation and Validation of Liquid Densities for Pure Compounds and Mixtures

Cited by 8 publications

References 41 publications

Liquid-Phase Speed of Sound and Vapor-Phase Density of Difluoromethane

Liquid-Phase Speed of Sound and Vapor-Phase Density of Difluoromethane

Вплив температури та тиску на термодинамічний коефіцієнт (∂V/∂T)p води

Can approximate integral equation theories accurately predict solvation thermodynamics?

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