Update: Reference Correlation for the Viscosity of Ethane [J. Phys. Chem. Ref. Data 44, 043101 (2015)]

Herrmann, Sebastian; Hellmann, Robert; Vogel, E.

doi:10.1063/1.5037239

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…One particular methodology for determining the residual contribution to viscosity is one used by Vogel and co-workers, ,,,, which incorporates a sophisticated fitting procedure, similar to that used for EOS development, with a large bank of initial terms with optimal terms selected based on regressing a critically evaluated set of data. Typical mathematical expressions included in the bank are double polynomials in reduced temperature and density, and also exponential factors of the reduced density, again very similar to terms in an equation of state approach.…”

Section: Models For Transport and Miscellaneous Properties Of Pure Fl...mentioning

confidence: 99%

“…The last term in eq 4 , Δ η c , is used to represent the behavior in the critical region. For viscosity, this term affects only a very small region in the immediate vicinity of the critical point, 288 and with the exception of relatively few fluids 66 , 70 , 102 , 176 , 264 , 265 , 281 , 282 is usually set to zero as there are not sufficient data for its evaluation. As an example, the critical enhancement for the viscosity of water contributes an amount greater than 2% to the total viscosity only with the narrow region 264 645.91 K < T < 650.7 K, 245.8 kg m –3 < ρ < 405.3 kg m –3 .…”

Section: Models For Transport and Miscellaneous Properties Of Pure Fl...mentioning

confidence: 99%

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The NIST REFPROP Database for Highly Accurate Properties of Industrially Important Fluids

Huber

Lemmon

Bell

et al. 2022

Ind. Eng. Chem. Res.

126

100

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The NIST REFPROP software program is a powerful tool for calculating thermophysical properties of industrially important fluids, and this manuscript describes the models implemented in, and features of, this software. REFPROP implements the most accurate models available for selected pure fluids and their mixtures that are valid over the entire fluid range including gas, liquid, and supercritical states, with the goal of uncertainties approaching the level of the underlying experimental data. The equations of state for thermodynamic properties are primarily of the Helmholtz energy form; a variety of models are implemented for the transport properties. We document the models for the 147 fluids included in the current version. A graphical user interface generates tables and provides extensive plotting capabilities. Properties can also be accessed through third-party apps or user-written code via the core property subroutines compiled into a shared library. REFPROP disseminates international standards in both the natural gas and refrigeration industries, as well as standards for water/steam.

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Section: Models For Transport and Miscellaneous Properties Of Pure Fl...mentioning

confidence: 99%

Section: Models For Transport and Miscellaneous Properties Of Pure Fl...mentioning

confidence: 99%

The NIST REFPROP Database for Highly Accurate Properties of Industrially Important Fluids

Huber

Lemmon

Bell

et al. 2022

Ind. Eng. Chem. Res.

126

100

View full text Add to dashboard Cite

show abstract

Measurements and modelling of the viscosity of (methane + ethane) mixtures at temperatures from (253.15 to 473.15) K with pressures up to 2 MPa

Humberg

Richter

Trusler

2020

The Journal of Chemical Thermodynamics

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New Formulation for the Viscosity of Isobutane

Herrmann

Vogel

2018

Journal of Physical and Chemical Reference Data

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A new viscosity formulation for isobutane, valid in the fluid region from the triple point to 650 K and to 100 MPa, is presented. It employs the reference equation of state by Bücker and Wagner [J. Phys. Chem. Ref. Data 35, 929 (2006)] and uses the residual quantity concept, in which the contributions for the zero-density viscosity and for the initial-density dependence were separately generated, while those for the critical enhancement and for the higher-density terms were pretreated. The contributions are formulated as a function of the reciprocal reduced temperature τ and the reduced density δ. The primary datasets used when developing the individual contributions were carefully evaluated. The final formulation includes 16 coefficients fitted with a state-of-the-art linear optimization algorithm. The expanded uncertainty (coverage factor k = 2) is estimated to be 0.5% at low pressures p ≤ 0.2 MPa and at temperatures 298 ≤ T∕K ≤ 627. In the vapor phase at subcritical temperatures T ≥ 298 K as well as in the supercritical region T ≤ 498 K at pressures p ≤ 30 MPa, the expanded uncertainty is given as 1.5%. It is increased to 4.0% and 6.0%, respectively, in regions where less reliable primary data exist. Moreover, it is assumed to amount to 6.0% in ranges in which primary viscosity datasets are not available, but the equation of state is valid. In the near-critical region, a value of the expanded uncertainty was not given because of a weakness of the reference equation of state and due to a possibly too small result for the critical enhancement of the viscosity experimentally found. Viscosity tables for the new formulation are given for the single-phase region, for the vapor-liquid phase boundary, and for the near-critical region.

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Update: Reference Correlation for the Viscosity of Ethane [J. Phys. Chem. Ref. Data 44, 043101 (2015)]

Cited by 6 publications

References 22 publications

The NIST REFPROP Database for Highly Accurate Properties of Industrially Important Fluids

The NIST REFPROP Database for Highly Accurate Properties of Industrially Important Fluids

Measurements and modelling of the viscosity of (methane + ethane) mixtures at temperatures from (253.15 to 473.15) K with pressures up to 2 MPa

New Formulation for the Viscosity of Isobutane

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