Measurements of gaseous diffusion coefficients for dilute and moderately dense gases by perturbation chromatography

Hu, Alexander Tzi-Chiang; Kobayashi, Riki

doi:10.1021/je60045a015

Cited by 32 publications

(7 citation statements)

References 14 publications

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“…As an illustration that correlations based on ρ r (i.e., V ) rather than p r are appropriate for mass diffusion, consider the data of Hu and Kobayashi which feature N 2 , Ar, and CH 4 as trace species in He at pressures between 1 and 6 MPa and temperatures from 248 to 323 K ( T r ≫ 1). Although p r > 4, the reduced density is small, ρ r = V c / V ≤ 0.16; the diffusivity data and ( D ij ) KT match to within 3% (other data for trace CO 2 are not as close).…”

Section: Relevant Data Presentation and Trendsmentioning

confidence: 99%

High-Pressure Binary Mass Diffusion Coefficients for Combustion Applications

Harstad

Bellan

2003

Ind. Eng. Chem. Res.

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A scaling for binary mass diffusion coefficients is developed using a corresponding states expression based on kinetic theory. The scaling is used to form nondimensional diffusion coefficients. Available data for high-pressure binary mass diffusion coefficients related to combustion applications are processed in conjunction with the scaling, leading to recommended scaled coefficient fits as a function of the reduced density. Data uncertainties and possible interpretation difficulties are examined. A means for comprehensive diffusion coefficient modeling over a broad (3 orders of magnitude) pressure range is suggested.

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Section: Relevant Data Presentation and Trendsmentioning

confidence: 99%

High-Pressure Binary Mass Diffusion Coefficients for Combustion Applications

Harstad

Bellan

2003

Ind. Eng. Chem. Res.

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“…Since p is the primitive variable, it is p, that is the pertinent correlation quantity at high p . As an illustration of correlations based on p, rather than p,, the data of [18] feature Nz, Ar and CH4 as trace species in H e at p = 1 -6 MPa (p, > 4) and…”

Section: Modeling Of High-pressure Diffusion Coefficientsmentioning

confidence: 99%

On the Determination of High-pressure Mass-diffusion Coefficients for Binary Mixtures

Harstad

Bellan

2003

41st Aerospace Sciences Meeting and Exhibit

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A model for high-pressure binary diffusion coefficient calculation is proposed based on considerations originating from recasting both the low pressure kinetic theory and the Stokes-Einstein infinite dilution expressions into forms consistent with corresponding states theory. These considerations lead to an ansatz that is an expression reflecting departures from the kinetic theory relationship through a division factor that is a function of the reduced species density and that becomes unity in the limit of low pressure gases. Available high pressure data sets extracted from the literature are used to derive correlations for the factor that are eventually categorized according to the species system. The typical uncertainty in these correlations is estimated as 10 to 15 %, with a maximum uncertainty of about 30% for the high density regime.

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“…(1) introducing the attractive contribution, ξ 12 S , and (2) Hu and Kobayashi (1970). b Takahashi and Hongo (1982).…”

Section: Equations For the Tracer Diffusion Coefficients Of Lennard-j...mentioning

confidence: 99%

A Predictive Equation for the Tracer Diffusion of Various Solutes in Gases, Supercritical Fluids, and Liquids

and

Ruckenstein

1997

Ind. Eng. Chem. Res.

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A predictive equation for the infinitely dilute diffusion coefficients of various solutes in gaseous and liquid phases is proposed. The expressions proposed previously for the tracer diffusion in binary hard sphere fluids are examined critically and a new expression, based on the molecular dynamics simulations of Alder et al. (1974), obtained. The obtained expression is extended first to a Lennard-Jones fluid and then, by introducing a coupling factor, to a real fluid. The molecular diameter and energy parameters used in the equation are calculated with generalized correlations and simple combining rules. The coupling factor is correlated with the acentric factor. The derived equation is tested against a large number of experimental data: 1443 points for 120 systems, including the diffusions of various solutes in gases, supercritical fluids, and liquids. Excellent predictions were obtained: the total absolute average deviation is only 8.42%. For most systems, the predicted errors are comparable to the experimental uncertainties.

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Measurements of gaseous diffusion coefficients for dilute and moderately dense gases by perturbation chromatography

Cited by 32 publications

References 14 publications

High-Pressure Binary Mass Diffusion Coefficients for Combustion Applications

High-Pressure Binary Mass Diffusion Coefficients for Combustion Applications

On the Determination of High-pressure Mass-diffusion Coefficients for Binary Mixtures

A Predictive Equation for the Tracer Diffusion of Various Solutes in Gases, Supercritical Fluids, and Liquids

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