laesecke_2017

A. Laesecke and C. D. Muzny, “Reference Correlation for the Viscosity of Carbon Dioxide”, J. Phys. Chem. Ref. Data 46, 013107 (2017)

Source record · Catalogue · Review register

DOI: 10.1063/1.4977429

Source kind: fit

Recorded technique: A reference correlation of the viscosity of carbon dioxide: the zero-density limit from Hellmann’s ab initio values scaled by 1.0055 to the most accurate measurements, in a form found by symbolic regression, plus initial-density and residual terms fitted to measurements, with densities from Span and Wagner’s equation of state.

Materials in structured entries: CO2

Dataset quantities: None recorded.

Contents: 0 datasets; 1 formula.

Curation notes

Identity VALIDATED by the library. The library’s copy is the NIST author manuscript; pages cited are its pdf pages.

THE ZERO-DENSITY VISCOSITY (Eq. 4, pdf p. 10; Table 2, pdf p. 57): eta0(T) = 1.0055 sqrt(T) / [a0 + a1 T^(1/6) + a2 exp(a3 T^(1/3)) + (a4 + a5 T^(1/3))/exp(T^(1/3)) + a6 sqrt(T)], in mPa s with T in K; a0..a6 = 1749.354893188350, -369.069300007128, 5423856.34887691, -2.21283852168356, -269503.247933569, 73145.021531826, 5.34368649509278. It represents Hellmann’s values within -0.059 % to +0.026 % and has no singularity below 100 K (pdf p. 10).

UNCERTAINTY (pdf p. 22): ‘Below the triple-point pressure of 0.51795 MPa, the uncertainty of the correlation is 0.2 % from 200 K to 700 K and 1 % up to 2000 K’; the estimates build on the expanded uncertainties of the data sources. Extrapolations below 200 K and above 2000 K are called physically realistic. optmat takes 200-2000 K, where an uncertainty is stated.

REPRODUCED: CoolProp 8.0.0’s carbon dioxide viscosity (reference key Laesecke-JPCRD-2017-CO2) at 1e-6 mol/m^3 equals Eq. (4) to 4e-10, 120-900 K (computed 2026-09-30).

Recorded bibliographic identity status: VALIDATED. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets

No datasets are recorded.

Formulas

laesecke_2017/eq4

{
  "id": "eq4",
  "material": "CO2",
  "equation": "Eq. (4), pdf p. 10; Table 2, pdf p. 57 (author manuscript)",
  "printed": "eta0 = 1.0055 sqrt(T)/[a0 + a1 T^(1/6) + a2 exp(a3 T^(1/3)) + (a4 + a5 T^(1/3))/exp(T^(1/3)) + a6 sqrt(T)]",
  "variable": "T in K; eta0 in mPa s",
  "range": "200-2000 K (stated uncertainty)",
  "coefficients": {
    "scale": "1.0055",
    "a0": "1749.354893188350",
    "a1": "-369.069300007128",
    "a2": "5423856.34887691",
    "a3": "-2.21283852168356",
    "a4": "-269503.247933569",
    "a5": "73145.021531826",
    "a6": "5.34368649509278"
  },
  "check": "CoolProp 8.0.0 equals it to 4e-10 (tests/test_transport.py)."
}

Corrections

No dataset errata are recorded in this source record.

Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the review register for the checks and decisions.