Thermal conductivity of methane-ethane mixtures at temperatures between 140 and 330 K and at pressures up to 70 MPa

Roder, H. M.; Friend, Daniel G.

doi:10.1007/bf00500333

Cited by 27 publications

(7 citation statements)

References 17 publications

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“…Roder and Friend [73] when the enhancement term is included; however, it also demonstrates that the present model is not adequate, and further work in this area is needed.…”

Section: Resultsmentioning

confidence: 83%

Documentation and assessment of the transport property model for mixtures implemented in NIST REFPROP (version 8.0)

Chichester¹,

Huber²

2008

136

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“…Roder and Friend [73] when the enhancement term is included; however, it also demonstrates that the present model is not adequate, and further work in this area is needed.…”

Section: Resultsmentioning

confidence: 83%

Documentation and assessment of the transport property model for mixtures implemented in NIST REFPROP (version 8.0)

Chichester¹,

Huber²

2008

136

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“…These asymptotic predictions are valid only in an extremely small region around the vapor-liquid critical line. Measurements on ~He + 4He [11], methane +ethane [12,13], and CO, +ethane [14] seem to indicate that the thermal conductivity exhibits a diverging critical enhancement, just like in a pure fluid, rather than approach a constant value as predicted by theory. We return to this point when we compare our crossover model with experimental data.…”

Section: Asymptotic Predictionsmentioning

confidence: 82%

“…For the system investigated in this work, for example, values for the mutual diffusivity and the thermal-diffusion ratio can be calculated from Eqs. (12) and (13) [15,16]. Finally, the model ~xplains why the observed thermal conductivity of simple binary fluid mixtures whose components have similar critical temperatures, such as CO, +C_,H 6 or 3He+ 4He [11,21], behaves like that of a one-component fluid in an appreciable range of temperatures and densities.…”

Section: Discussionmentioning

confidence: 96%

Transport properties of fluid mixtures in the critical region

Luettmer-Strathmann

Sengers

1994

Int J Thermophys

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Transport properties of fluid mixtures exhibit anomalous behavior near the vapor-liquid critical line. These anomalies are a result of long-range fluctuations in the system in the vicinity of a critical point. We use mode-coupling theory to describe the critical enhancements of the thermal conductivity, the viscosity, the mutual diffusivity, and the thermal-diffusion coefficients of binary mixtures. The resulting expressions not only are valid in the asymptotic critical region but also describe the crossover to regular behavior far away from a critical point. The crossover functions depend on the thermodynamic properties of the mixtures, background values of all transport coefficients, and two concentration-dependent cutoff wave numbers. We compare the proposed crossover model with experimental thermal-conductivity data for mixtures of carbon dioxide and ethane in the critical region and find good agreement between theory and experiment.

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“…The thermal conductivity of methane-ethane mixtures has been measured over a wide range of temperature and pressure in a transient hotwire instrument by Roder and Friend [ 23 ]. Their results have an estimated uncertainty of + 1.5 % except in the critical region, where it may be poorer.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Thermophysical properties of natural gases for on-line metering

1995

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The evaluation of the background transport properties of natural gas multicomponent mixtures over a moderate temperature and pressure range around ambient is considered in the context of the development of certifiable sensors for the measurement of mass and energy fluxes. The best available, theoretically based procedures to predict the properties are compared with experimental information to test the internal consistency, accuracy, and range of validity of the prediction. This is of primary concern to the demonstration of the viability of such sensors. It is shown that for low to moderate pressures, it is possible to achieve an internal consistency of the order of a few parts in a thousand and an accuracy of better than + 1%. At very high pressures the predictive scheme is also satisfactory, with errors of the order of a few percent. However, the procedure employed here systematically underestimates the thermal conductivity of the gas mixtures studied for intermediate pressures owing to the neglect of the critical enhancement even for temperatures quite far removed from the critical. The range of conditions for which the critical enhancement of the thernaal conductivity is significant in mixtures is explored with data for binary mixtures of methane and ethane.

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Thermal conductivity of methane-ethane mixtures at temperatures between 140 and 330 K and at pressures up to 70 MPa

Cited by 27 publications

References 17 publications

Documentation and assessment of the transport property model for mixtures implemented in NIST REFPROP (version 8.0)

Documentation and assessment of the transport property model for mixtures implemented in NIST REFPROP (version 8.0)

Transport properties of fluid mixtures in the critical region

Thermophysical properties of natural gases for on-line metering

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