Correlation and prediction of dense fluid transport coefficients

Assael, Marc J.; Dymond, J. H.; Papadaki, Maria; Patterson, Patricia M.

doi:10.1016/0378-3812(92)87021-e

Cited by 111 publications

(122 citation statements)

References 25 publications

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“…Somewhat similar conclusions were deduced by Matthews et al 22 and Rodden et al 41 Fig. 3 is a schematic diagram of the Taylor dispersion apparatus used in this work; a full description of this equipment can be found in Cadogan et al 1 One modification was implemented in the present study, which was to heat the syringe pump and the portions of the flow path outside the thermostatic bath to a temperature of approximately 313 K so as to avoid freezing of hexadecane at high pressures.…”

supporting

confidence: 90%

“…The rough-hard-sphere theory has been successfully used in various forms to correlate transport properties of both pure [19][20][21][22][23][24][25][26] and binary systems. 21,[27][28][29][30][31] For mutual diffusion, the theory may be built up starting from the kinetic-theory expression for the mutual diffusion coefficient of a dilute binary mixture of smooth hard spherical molecules: …”

Section: Rough-hard-sphere Theorymentioning

confidence: 99%

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Diffusion Coefficients of Carbon Dioxide in Eight Hydrocarbon Liquids at Temperatures between (298.15 and 423.15) K at Pressures up to 69 MPa

et al. 2016

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We report experimental measurements of the mutual diffusion coefficients in binary systems comprising CO2 + liquid hydrocarbon measured at temperatures between (298.15 and 423.15) K and at pressures up to 69 MPa. The hydrocarbons studied were the six normal alkanes hexane, heptane, octane, decane, dodecane and hexadecane, one branched alkane, 2,6,10,15,19,23-hexamethyltetracosane (squalane), and methylbenzene (toluene). The measurements were performed by the Taylor Dispersion method at effectively infinite dilution of CO2 in the alkane, and the results have a typical standard relative uncertainty of 2.6 %. Pressure was found to have a major impact, reducing the diffusion coefficient at a given temperature by up to 55 % over the range of pressures investigated. A correlation based on the Stokes-Einstein model was investigated in which the effective hydrodynamic radius of CO2 was approximated by a linear function of the reduced molar volume of the solvent. This represented the data for the normal alkanes only with an average absolute relative deviation (AAD) of 5 %. A new universal correlation, based on the rough-hard-sphere theory, was also developed which was able to correlate all the experimental data as a function of reduced molar volume with an AAD of 2.5 %.2

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supporting

confidence: 90%

Section: Rough-hard-sphere Theorymentioning

confidence: 99%

Diffusion Coefficients of Carbon Dioxide in Eight Hydrocarbon Liquids at Temperatures between (298.15 and 423.15) K at Pressures up to 69 MPa

et al. 2016

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“…This model has been developed 45,46 where i and m subscript are used for pure compounds and mixture, respectively.…”

Section: High Pressure Viscosity Modellingmentioning

confidence: 99%

Dynamic Viscosity for HFC-134a + Polyether Mixtures up to 373.15 K and 140 MPa at Low Polyether Concentration. Measurements and Modeling

Comuñas

Baylaucq

Boned

et al. 2004

Ind. Eng. Chem. Res.

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Abstract:This paper reports viscosity data for mixtures containing a refrigerant and a lubricant (triethylene glycol dimethyether, TriEGDME or tetraethylene glycol dimethylether, TEGDME), at 12% mass fraction of TriEGDME and 14% of TEGDME respectively. The measurements (140 data points) have been carried out versus pressure (between 10 and 140 MPa) in the monophasic liquid state from 293.15 to 373.15 K. Due to the fact that at normal pressure and temperature the HFC-134a and the polyethers are not in the same single phase (the refrigerant is a gas whereas the polyethers are liquids) accurate measurements of their mixtures require specific procedures for the samples preparation and the filling of the apparatus. A specially designed isobaric transfer falling-body viscometer is used in this work. The viscosity of the mixtures is in average 40% higher than that of the pure refrigerant, and this increase is more noticeable at low temperatures.The experimental viscosities have been used in order to check the predictive and correlation ability of several viscosity models (mixing rules, Geller and Davis method, self referencing model, hard sphere theory, free volume model and friction-theory). Most of the studied models under estimate dynamic viscosity values over all the temperature and pressure ranges.

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“…The hard-sphere model for the transport properties of dense fluids was proposed by Dymond [17,18], and refined into a practical predictive tool by Dymond, Assael and their collaborators [7][8][9][10][11]. In the smooth-hard-sphere model, all thermodynamic and transport properties are athermal and may be conveniently expressed as functions of the reduced volume V* = Vm/V0, where Vm is the molar volume, V0 = NAσ 3 /√2 is the molar volume for close-packed hard spheres, NA is Avagadro's constant and σ is the diameter of the molecules.…”

Section: The Hard-sphere Modelmentioning

confidence: 99%

“…The only tractable solutions developed to date are based on assuming that the molecules interact as hard spheres and that their collisions are uncorrelated. The resulting Enskog equation for the viscosity of a dense hard-sphere fluid has formed the basis for several semi-theoretical approaches, two of which in particular have found practical application: the Dymond and Assael (DA) approach [7][8][9][10][11] and the Vesovic-Wakeham (VW) model [12][13][14][15][16]. Underlying these approaches is the idea that the transport properties of real dense fluids are dominated by repulsive interactions between molecules and may be related to those of an equivalent hard-sphere fluid.…”

Section: Introductionmentioning

confidence: 99%