Tables of experimental data used for the correlation of the thermophysical properties of ethane

Friend, Daniel G.; Ely, James F.; Ingham, Hepburn

doi:10.6028/nist.ir.3953

Cited by 11 publications

(15 citation statements)

References 10 publications

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“…For comparison with experimental data, we use an equation of state for ethane based on a critical review of the available spectroscopic and thermodynamic experiments. 24 Figure 4 shows that the HRDS interpolation function provides a good approximation to the experimental data in the temperature range where data is available. Both HRDS and T91 utilize the harmonic oscillator and rigid rotor limiting behavior, but HRDS puts greater emphasis on accurately reflecting how those asymptotes are reached.…”

Section: A Ethane Heat Capacitymentioning

confidence: 93%

The hindered rotor density-of-states interpolation function

McClurg

Flagan

Goddard

1997

The Journal of Chemical Physics

217

245

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We construct an approximation to the partition function for hindered rotors based entirely on their asymptotic behavior and no fitting parameters. The approximant is shown to be quite accurate in all temperature ranges. Explicit auxiliary functions are derived for the Helmholtz free energy, internal energy, heat capacity, and entropy. We apply this function to estimating the heat capacity and unimolecular dissociation rate for ethane.

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Section: A Ethane Heat Capacitymentioning

confidence: 93%

The hindered rotor density-of-states interpolation function

McClurg

Flagan

Goddard

1997

The Journal of Chemical Physics

217

245

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“…The critical enhancement of the viscosity is observed in only a very small region around the critical point, 40,116,136 and at this time, sufficiently accurate experimental data for methanol are not available in this limited region to support the development of a critical-enhancement term. We note, however, that according to scaling-law theory the viscosity of a pure fluid at the gas-liquid critical point is infinite.…”

Section: The Entire Viscosity Surfacementioning

confidence: 91%

A New Reference Correlation for the Viscosity of Methanol

Xiang¹,

Laesecke²,

Huber³

2006

Journal of Physical and Chemical Reference Data

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A new reference-quality correlation for the viscosity of methanol is presented that is valid over the entire fluid region, including vapor, liquid, and metastable phases. To describe the zero-density viscosity with kinetic theory for polar gases, a new expression for the collision integral of the Stockmayer potential is introduced. The initial density dependence is based on the Rainwater-Friend theory. A new correlation for the third viscosity virial coefficient is developed from experimental data and applied to methanol. The high-density contribution to the viscosity is based on the Chapman-Enskog theory and includes a new expression for the hard-sphere diameter that is a function of both temperature and density. The resulting correlation is applicable for temperatures from the triple point to 630 K at pressures up to 8 GPa. The estimated uncertainty of the resulting correlation ͑with a coverage factor of 2͒ varies from 0.6% in the dilute-gas phase between room temperature and 630 K, to less than 2% for the liquid phase at pressures up to 30 MPa at temperatures between 273 and 343 K, 3% for pressures from 30 to 100 MPa, 5% for the liquid from 100 to 500 MPa, and 10% between 500 MPa and 4 GPa. At very high pressures, from 4 to 8 GPa, the correlation has an estimated uncertainty of 30% and can be used to indicate qualitative behavior. © 2006 by the U.S. Secretary of Commerce on behalf of the United States. All rights reserved.

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“…Although , T , and D T are not known in general as functions of and T, experimental data on specific solvents ͑including carbon dioxide and ethane͒ have been used to fit them to polynomial and exponential expansions in these variables. 33,34 We use the fitted expressions for ethane 34 to determine the isotherms of T 1 ͑the expression for carbon dioxide is significantly more complicated͒, two of which are shown in Fig. 10͑a͒ for densities in the range of 1 to 5 mol/L.…”

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confidence: 99%

Vibrational lifetimes and vibrational line positions in polyatomic supercritical fluids near the critical point

Urdahl

Myers

Rector

et al. 1997

The Journal of Chemical Physics

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Articles you may be interested inVibrational spectroscopy and relaxation of an anharmonic oscillator coupled to harmonic bath Picosecond infrared pump-probe experiments are used to measure the vibrational lifetime of the asymmetric (T 1u ) CO stretching mode of W͑CO͒ 6 in supercritical CO 2 , C 2 H 6 , and CHF 3 as a function of solvent density and temperature. As the density is increased at constant temperature from low, gaslike densities, the lifetimes become shorter. However, in all three solvents, it is found that within a few degrees of the critical temperature (T r ϵT/T c Ϸ1.01), the lifetimes are essentially constant over a wide range of densities around the critical value ( c ). When the density is increased well past c , the lifetimes shorten further. At higher temperature (T r ϭ1.06) this region of constant vibrational lifetime is absent. Infrared absorption spectra of W͑CO͒ 6 and Rh͑CO͒ 2 acac in supercritical CO 2 , C 2 H 6 , and CHF 3 acquired for the same isotherms show that the vibrational spectral peak shifts follow similar trends with density. The peak positions shift to lower energy as the density is increased. Near the critical point, the peak positions are density independent, and then redshift further at densities well above c . It is shown that critical fluctuations play a dominant role in the observed effects. Theoretical calculations ascribe the density independence of the observables to the cancellation of various rapidly changing quantities near the critical point. The theory's calculation of density independence implicitly involves averages over all local densities and does not involve any form of solute-solvent clustering.

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Tables of experimental data used for the correlation of the thermophysical properties of ethane

Cited by 11 publications

References 10 publications

The hindered rotor density-of-states interpolation function

The hindered rotor density-of-states interpolation function

A New Reference Correlation for the Viscosity of Methanol

Vibrational lifetimes and vibrational line positions in polyatomic supercritical fluids near the critical point

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