gernert_2013

G. J. Gernert, “A New Helmholtz Energy Model for Humid Gases and CCS Mixtures”, doctoral thesis, Ruhr-Universität Bochum (2013)

Source record · Catalogue · Review register

No DOI is recorded.

Source kind: fit

Recorded technique: Fit: a multi-fluid Helmholtz-energy model (the GERG form) for the fifteen binary mixtures of CO2, H2O, N2, O2, Ar and CO, with new departure functions for CO2-H2O, CO2-Ar and H2O-N2, fitted to vapour-liquid equilibrium, density, caloric and second virial data of the mixtures.

Materials in structured entries: None recorded.

Dataset quantities: None recorded.

Contents: 0 datasets; 0 formulas.

Curation notes

A doctoral thesis, without a DOI; identity ASSERTED by the library (a public copy is hosted by NIST). Printed page = pdf page - 10 (checked at pp. 128-130 and 198). The library’s extraction is PARTIAL (pdf pages 4 and 220 empty), and its text of Table 6.1’s header is garbled; that table was read from the pdf’s text layer.

THE PAIRS (Tables 2.9-2.10, pp. 24-25): all fifteen binaries of CO2, H2O, N2, O2, Ar and CO. New departure functions: CO2-H2O, CO2-Ar, H2O-N2 (H2O-O2 and H2O-CO reuse H2O-N2’s with a fitted F). CO2-N2’s departure function, and the N2-O2 and CO-Ar parameters, are GERG-2008’s unchanged; O2-CO is unfitted (no data). These are the pairs CoolProp names `Gernert-Thesis-2013`.

THE VIRIAL LIMITATION (§5.2.4, pp. 127-130; checked in GPT-6’s review of OEP 4 and again by a reader, 2026-09-30): the model’s second virial coefficient as a function of composition ‘is clearly not quadratic, which is again a result of the corresponding states approach’ (p. 129), and the quadratic mixing rule, Eq. (5.11), ‘is not correctly reproduced by the model’ (p. 130). It is shown for H2O-N2 (Fig. 5.23), with ‘only a small influence’ when the components’ critical temperatures are similar (p. 130).

CROSS SECOND VIRIAL DATA (Table A2.1, p. 198; deviations in cm^3/mol per its note a, though the column head reads %): CO2-Ar: Bose and Cole 1970 (5 points, 320-322 K, none used, deviation 6.169), Cottrell et al. 1956 (3, none used), Martin et al. 1982 (3, all used), Schonmann 1971 (3, all used); 14 in all, 6 used (Table 5.3, p. 95). N2-O2: Fostiropoulos 1988 (87-475 K), Gorski and Miller 1953 (303 K), Hall and Iglesias-Silva 1994 (188-480 K), Martin 1982 (289-319 K), Wilson 1965 (72-144 K). N2-Ar: Brewer and Vaughn 1969 (123-323 K), Crain and Sonntag 1966 (143-273 K), Dymond and Smith 1980 (213-474 K), Elshayal and Lu 1975 (353-463 K), Knobler 1959 (90 K), Martin (289-319 K), Schramm and Mueller 1982 (296 K), Wilson 1965, Zandbergen and Beenakker 1967 (170-270 K). O2-Ar: Martin (289-319 K), Vatter et al. 1996 (296-463 K). The Elshayal and Lu reference is printed as an ethylene-propane paper, apparently a citation error.

STATED UNCERTAINTY (Table 6.1, p. 137): density of the gas at reduced density below 0.6: N2-O2 < 0.1 %, N2-Ar < 0.5 %, O2-Ar < 1.0 %, CO2-N2 < 0.3 %, CO2-Ar < 0.5 %, CO2-O2 < 1.0 %; below 5 MPa, under 1 % expected (p. 137). N2-O2 is within +-0.025 % below 7 MPa (p. 123); O2-Ar rests on Masson and Dolley’s 1923 data at 298 K, reproduced within +-2 % with a -1.3 % offset (p. 125). Nothing transcribed.

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

Datasets

No datasets are recorded.

Formulas

No formulas are recorded.

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.