Helium–Hydrogen Liquid–Vapor Equilibrium to 100 atm

Sneed, C. M.; Sonntag, R. E.; Wylen, Gordon John Van

doi:10.1063/1.1670414

Cited by 26 publications

(8 citation statements)

References 2 publications

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“…44 Curiously, we did not find any measurements on densities of these mixtures, other than those for pure components. In this work we used experimental VLE data by Streett et al (1964), 57 Sonntag et al (1964), 58 Sneed et al (1968), 59 and Streett et al (1973). 44 All these authors assume that their hydrogen is normal hydrogen, due to the short cooling and sampling times.…”

Section: The Helium-hydrogen Mixturementioning

confidence: 99%

Equation of state and force fields for Feynman–Hibbs-corrected Mie fluids. II. Application to mixtures of helium, neon, hydrogen, and deuterium

Aasen

Hammer

Müller

et al. 2020

The Journal of Chemical Physics

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We extend the SAFT-VRQ Mie equation of state, previously developed for pure fluids [Aasen et al., J. Chem. Phys. 151, 064508 (2019)], to fluid mixtures of particles interacting via Mie potentials with Feynman-Hibbs quantum corrections of first (Mie-FH1) or second order (Mie-FH2). This is done using a third-order Barker-Henderson expansion of the Helmholtz energy from a non-additive hard-sphere reference system. We survey existing experimental measurements and ab initio calculations of thermodynamic properties of mixtures of neon, helium, deuterium and hydrogen, and use them to optimize the Mie-FH1 and Mie-FH2 force fields for binary interactions. Simulations employing the optimized force fields are shown to follow the experimental results closely over the entire phase envelopes. SAFT-VRQ Mie reproduces results from simulations employing these force fields, with the exception of near-critical states for mixtures containing helium. This breakdown is explained in terms of the extremely low dispersive energy of helium, and the challenges inherent in current implementations of the Barker-Henderson expansion for mixtures. The interaction parameters of two cubic equations of state (SRK, PR) are also fitted to experiments, and used as performance benchmarks. There are large gaps in the ranges and properties that have been experimentally measured for these systems, making the force fields presented especially useful.

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Section: The Helium-hydrogen Mixturementioning

confidence: 99%

Equation of state and force fields for Feynman–Hibbs-corrected Mie fluids. II. Application to mixtures of helium, neon, hydrogen, and deuterium

Aasen

Hammer

Müller

et al. 2020

The Journal of Chemical Physics

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“…He . The experimental x−line of Sneed et al [3] is shown in Fig. 2 for the low temperature and low pressure mixture.…”

Section: The H2-he Mixturementioning

confidence: 99%

“…The experimental s-line T = T s (P ) and gline T = T g (P ) have been determined in Fig. 3 of Sneed et al [3]) in the laboratory.…”

Section: A Barotropic Phenomenon and Gravitational Inversionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Some early experimental studies [1][2][3] have shown that at coexistence, at low temperature, the mixture shows a strong asymmetry in species concentrations in the liquid relative to the vapor phase, with an abundance of helium atoms in the vapor. This phenomenon results in the liquid floating above its vapor [3] since helium has approximately twice the molecular weight of hydrogen. Such experimental coexistence studies has later been extended at higher temperature and pressure [4,5] allowing to determine a quite complete picture for the coexistence phase diagram of this mixture in the temperature range from 15.5 K to 360 K and in the pressure range from 5 bars to 75 kbars.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Two-phase coexistence for hydrogen-helium mixtures

Fantoni

2015

Phys. Rev. E

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We use our newly constructed quantum Gibbs ensemble Monte Carlo algorithm to perform computer experiments for the two phase coexistence of a hydrogen-helium mixture. Our results are in quantitative agreement with the experimental results of C. M. Sneed, W. B. Streett, R. E. Sonntag, and G. J. Van Wylen. The difference between our results and the experimental ones is in all cases less than 15% relative to the experiment, reducing to less than 5% in the low helium concentration phase. At the gravitational inversion between the vapor and the liquid phase, at low temperatures and high pressures, the quantum effects become relevant. At extremely low temperature and pressure the first component to show superfluidity is the helium in the vapor phase.

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4.2.2.3 Inorganic - inorganic systems

Beggerow¹

High-Pressure Properties of Matter

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Helium–Hydrogen Liquid–Vapor Equilibrium to 100 atm

Cited by 26 publications

References 2 publications

Equation of state and force fields for Feynman–Hibbs-corrected Mie fluids. II. Application to mixtures of helium, neon, hydrogen, and deuterium

Equation of state and force fields for Feynman–Hibbs-corrected Mie fluids. II. Application to mixtures of helium, neon, hydrogen, and deuterium

Two-phase coexistence for hydrogen-helium mixtures

4.2.2.3 Inorganic - inorganic systems

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