Comparative analysis of some representative models of viscosity versus pressure in the case of various hydrocarbons and their mixtures

Boned, Christian; Ettahir, Aziz; Lagourette, B.; Xans, P.; Gao, Guang‐Hua

doi:10.1007/bf02663734

Cited by 6 publications

(3 citation statements)

References 26 publications

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“…The MD (28%) was found at T = 353.15 K, p = 60 MPa for the mixture 0.9879 CO 2 + 0.0121 PEC9. The results obtained can be considered quite satisfactory, and are similar to those obtained by Et‐Tahir et al68 and Boned et al69 for binary mixtures such as toluene + pristane and toluene + 1‐ methylnaphthalene, or by Baylaucq et al70, 71 for the ternary mixture heptane + 1‐methylnaphthalene + methylcyclohexane. Baylaucq et al66 have proposed a modification of the self‐referencing method by fitting the nine parameters a , b , …, i against each pure compound.…”

Section: Resultssupporting

confidence: 87%

Prospective study of the ability of serial measurements of serum chromogranin A and gastrin to detect changes in tumor burden in patients with gastrinomas

Abou–Saif

Gibril

Ojeaburu

et al. 2003

Cancer

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This article reports densities and viscosities up to 60 MPa and from 303.15 to 353.15 K on two binary mixtures of CO2 and lubricant pentaerythritol tetra‐2‐ethylhexanoate with 7.8% and 14.4% mass fraction of lubricant. Because CO2 and the lubricant are not in the same phase at atmospheric pressure and room temperature, a specially‐designed vibrating‐wire apparatus has been used. The experimental data, together with our previous data for six mixtures of CO2 and three polyolesters, have been used to test the predictive and correlation ability of several models: simple mixing laws, the self‐referencing method, and the hard‐sphere and free volume models. In general, it is not possible to predict the viscosity with deviations smaller than 10%. The hard‐sphere model and the self‐referencing model are the more adequate to represent the viscosity of these mixtures. Most of the models studied underestimate the viscosities over the investigated (T,p) range. © 2008 American Institute of Chemical Engineers AIChE J, 2008

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Section: Resultssupporting

confidence: 87%

Prospective study of the ability of serial measurements of serum chromogranin A and gastrin to detect changes in tumor burden in patients with gastrinomas

Abou–Saif

Gibril

Ojeaburu

et al. 2003

Cancer

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show abstract

“…The MD (28%) was found at T 5 353.15 K, p 5 60 MPa for the mixture 0.9879 CO 2 1 0.0121 PEC9. The results obtained can be considered quite satisfactory, and are similar to those obtained by Et-Tahir et al 68 and Boned et al 69 for binary mixtures such as toluene 1 pristane and toluene 1 1-methylnaphthalene, or by Baylaucq et al 70,71 for the ternary mixture heptane 1 1-methylnaphthalene 1 methylcyclohexane. Baylaucq et al 66 have proposed a modification of the self-referencing method by fitting the nine parameters a, b, .…”

Section: -35supporting

confidence: 89%

High‐pressure viscosity and density of carbon dioxide + pentaerythritol ester mixtures: Measurements and modeling

et al. 2008

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This article reports densities and viscosities up to 60 MPa and from 303.15 to 353.15 K on two binary mixtures of CO 2 and lubricant pentaerythritol tetra-2-ethylhexanoate with 7.8% and 14.4% mass fraction of lubricant. Because CO 2 and the lubricant are not in the same phase at atmospheric pressure and room temperature, a specially-designed vibrating-wire apparatus has been used. The experimental data, together with our previous data for six mixtures of CO 2 and three polyolesters, have been used to test the predictive and correlation ability of several models: simple mixing laws, the self-referencing method, and the hard-sphere and free volume models. In general, it is not possible to predict the viscosity with deviations smaller than 10%. The hard-sphere model and the self-referencing model are the more adequate to represent the viscosity of these mixtures. Most of the models studied underestimate the viscosities over the investigated (T,p) range.

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“…In a previous study carried out at the laboratory [13] [14]a method was presented whereby (P,T) of fluid in the liquid state could be calculate from its viscosity at P 0 =0.1 MPa and at a reference temperature T 0 (generally ambient . As the coefficients used in the method are fixed independently of the nature of the system studied, this gives a character of generality to the model.…”

Section: A the Self-referencing Methodmentioning

confidence: 99%

Performance of the Self-Referencing Model on the Determination of Viscosity versus Pressure and Temperature of Various Hydrocarbons and Their Mixtures

Et-Tahir*,

Malzi,

Boned

et al. 2019

IJITEE

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The predictive model of the viscosimetric behavior studied in this article is the self-referencing model developed in our laboratory by KANTI et al. The dominant idea of this method is to characterize the dynamic viscosity (P,T) of a fluid just knowing its viscosity at P0=0.1MPa and at a reference temperature T0 (generally ambient temperature). For this purpose, we used the database developed by us (more than 15000 experimental couples P, T of 56 references) from which we extracted 4304 viscosity values (P,T) corresponding to 1866 experimental values of pure substances and 2213 of mixtures with 216 values of petroleum cuts Our study shows that the absolute average deviation respectively for pressures ≤ 1000 bars and ≤ 5055 bars (7.3% and 10.5%) obtained for pure substances (≥6 carbons) and (6.8 and 7.5%) for mixtures is satisfactory. Moreover when coupled with mixing rules (GRUMBERG-NISSAN and KENDALL-MONROE equations) without adjustable parameters it was able to account satisfactory for the variation of the viscosity (P,T,x) of the mixtures on the simple knowledge of the viscosity of the components of the mixture considered, at reference temperature T0 and at 0.1MPa. For all the mixtures studies an absolute average deviation respectively for pressures ≤1000 bar and ≤5055 bars of 8.6% and 9.8 without binary C1+C10 and 12.5% and 13% with binary C1+C10 was observed. It should also be noted that the self-referencing method seems to be particularly interesting for the restitution of the viscosities of systems containing heavy hydrocarbons in the liquid state and finds its limits for substances on gaseous state or light hydrocarbons (<6 carbons). The method depends also on the quality of the adjustment of the coefficients. If we consider that the coefficients were initially adjusted to moderately heavy substances, it might be interesting to resume the calibration procedure by including lighter substances

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Comparative analysis of some representative models of viscosity versus pressure in the case of various hydrocarbons and their mixtures

Cited by 6 publications

References 26 publications

Prospective study of the ability of serial measurements of serum chromogranin A and gastrin to detect changes in tumor burden in patients with gastrinomas

Prospective study of the ability of serial measurements of serum chromogranin A and gastrin to detect changes in tumor burden in patients with gastrinomas

High‐pressure viscosity and density of carbon dioxide + pentaerythritol ester mixtures: Measurements and modeling

Performance of the Self-Referencing Model on the Determination of Viscosity versus Pressure and Temperature of Various Hydrocarbons and Their Mixtures

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