Thermal conductivity of the hydrogen-helium mixture

Shashkov, A. G.; Kamchatov, F. P.; Abramenko, T. N.

doi:10.1007/bf00842864

Cited by 8 publications

(3 citation statements)

References 10 publications

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“…This system exhibits thermal conductivities that are far outside the predictions of classical approaches such as Maxwell theory or the limits of series and parallel resistance. In accordance with the experimental results for He-H 2[19][20][21], the system displays a minimum in the thermal conductivity below both the pure fluid thermal conductivities. This conclusively demonstrates that "anomalous" thermal conductivities are not only possible but a fundamental feature of simple molecular fluids such as the binary hard-sphere gas.To further validate the Enskog and NEMD results, equilibrium simulations with N = 32000 spheres in a cubic system are equilibrated for 1000 N events before being run for a further 100000 N events to calculate L uu , L u1 , and L 11 for this system.…”

supporting

confidence: 88%

“…This limit is also particularly interesting as the current discussion in nanofluids echoes previous controversy over reported dehancements in the thermal conductivity of He-H 2 gas mixtures [19]. Although the source of the original controversy (a sharp minimum in conductivity with concentration) was later shown to be unrepeatable [20,21], a shallower minimum still remains and demonstrates that thermal conductivity can lie outside the series-parallel bounds and even beyond the pure fluid values.…”

supporting

confidence: 59%

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Anomalous heat transport in binary hard-sphere gases

et al. 2019

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Equilibrium and non-equilibrium molecular dynamics (MD) are used to investigate the thermal conductivity of binary hard-sphere fluids. It is found that the thermal conductivity of a mixture can not only lie outside the series and parallel bounds set by their pure component values, but can lie beyond even the pure component fluid values. The MD simulations verify that revised Enskog theory can accurately predict non-equilibrium thermal conductivities at low densities and this theory is applied to explore the model parameter space. Only certain mass and size ratios are found to exhibit conductivity enhancements above the parallel bounds and dehancement below the series bounds. The anomalous dehancement is experimentally accessible in helium-hydrogen gas mixtures and a review of the literature confirms the existance of mixture thermal conductivity below the series bound and even below the pure fluid values, in accordance with the predictions of revised Enskog theory. The results reported here may reignite the debate in the nanofluid literature on the possible existence of anomalous thermal conductivities outside the series/parallel bounds as this work demonstrates they are a fundamental feature of even simple fluids.

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supporting

confidence: 88%

supporting

confidence: 59%

Anomalous heat transport in binary hard-sphere gases

et al. 2019

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“…Helium was used as the carrier gas for the isobutane + CO2 measurements, generally an ideal carrier gas when using a TCD because it has a much greater thermal conductivity than most other compounds, providing a strong response to both isobutane and CO2. Hydrogen is the only gas with a higher thermal conductivity than helium and the thermal conductivity of mixtures of hydrogen and helium does not vary as a monotonic function of mole fraction [34,35]. Therefore, helium is not a suitable carrier gas when detecting hydrogen using a TCD and argon was used in its place for the isobutane + H2 measurements.…”

Section: Methodsmentioning

confidence: 99%

Phase Behaviour of Isobutane + CO2 and Isobutane + H2 at Temperatures between 190 and 400 K and at Pressures up to 20 MPa

Latcham,

Trusler

2023

Preprint

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Mixtures containing isobutane, carbon dioxide, and/or hydrogen are found in various industrial processes, green refrigerant systems, and the growing hydrogen industry. Understanding the thermophysical properties of these mixtures is essential for these processes, and depends on reliable experimental data. Making use of an automated static-analytical apparatus, measurements were made of the phase behaviour of binary mixtures of isobutane with CO2 and with H2, extending the range of available data for both mixtures. Measurements of the system isobutane + CO2 were carried out along three isotherms at temperatures of (240, 280, and 310) K with pressures from the lower limit of the sampling system (~ 0.5 MPa) to the mixture critical pressure. The results exhibit good agreement with literature data. Measurements on isobutane + H2 were carried out along nine isotherms at temperatures of (190, 240, 280, 311, 339, 363, 375, 390, and 400) K with pressures up to 20 MPa, covering a much broader range of conditions than the one prior investigation. The results have been used to optimise temperature dependant binary parameters in the Peng-Robinson equation of state with two different mixing rules. This approach was found to perform well in comparisons to alternative models.

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