The friction theory (f-theory) for viscosity modeling

Quiñones-Cisneros, Sergio E.; Zéberg-Mikkelsen, Claus K.; Stenby, Erling Halfdan

doi:10.1016/s0378-3812(00)00310-1

Cited by 245 publications

(263 citation statements)

References 62 publications

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“…In the first version of this theory 25 the viscosity of each pure compounds is modelled with the following expressions for the friction coefficients:…”

Section: Friction-theorymentioning

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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“…In the first version of this theory 25 the viscosity of each pure compounds is modelled with the following expressions for the friction coefficients:…”

Section: Friction-theorymentioning

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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“…There are a number of approaches that have been used to model the viscosity of a fluid over a wide range of conditions including the friction theory model, 106,107 free-volume and friction models, 1,2,13 other free-volume models, 63,136 as well as completely empirical correlations. 96 We take a different approach here, and use an advanced residual concept for the correlation of the viscosity.…”

Section: Introductionmentioning

confidence: 99%

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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“…Five different models with a physical and theoretical background are studied. The considered models are the well-known hard-sphere-scheme [5,6], the free-volume approach [7][8][9], the self-referencing model [10,11], the friction-theory [12,13] and a molecular dynamics approach [14]. In addition to these models, the simple mixing laws of Grunberg-Nissan [15] and Katti-Chaudhri [16] are also applied in the representation of the viscosity behavior of this binary system.…”

Section: Introductionmentioning

confidence: 99%