Modeling interfacial tension of (CH4+N2)+H2O and (N2+CO2)+H2O systems using linear gradient theory

Interfacial tensions of the (CO 2 + N 2 + H 2 O) system at temperatures of (298 to 448) K and pressures up to 40 MPa

“…The simple method produces predictions with AAD of 4.8 % for all temperatures and pressures measured. This is compared with the AAD of 1.8 % reported by Khosharay and Varaminian [34], using a linear-gradient model based on the CPA equation of state, with the experimental data of Yan et al [8].…”

“…Yan et al [8] tested a GT model against their experimental data for the (CO2 + N2 + H2O) system but concluded that it was unsuitable. Khosharay and Varaminian [34] combined the cubic-plus-association equation of state (CPA EOS) with GT and applied this successfully to systems involving high concentrations of carbon dioxide in the vapour phase, using data from Georgiadis et al [3] and Yan et al [8]. The model predicted (N2 + H2O) interfacial tensions with average absolute relative deviations (AAD) of 0.5 %; (CO2 + H2O) interfacial tensions with AAD of 2.0 %; and (CO2 + N2 + H2O) interfacial tensions with AAD of 1.8 %.…”

Interfacial tensions of systems comprising water, carbon dioxide and diluent gases at high pressures: Experimental measurements and modelling with SAFT-VR Mie and square-gradient theory

“…An overview of the published modelling studies for the systems of interest in this paper is presented in Table 1. Previous modelling studies of (H 2 O + CO 2 ) cover a wide range of pressures up to 60 MPa, within a more limited temperature range from 287 K to 398.15 K [14,25,26,[28][29][30][31][32][33][34][35][36], exempting the study of [28] in which the system was considered, but no results presented. These ranges of temperature and pressure cover both vapour-liquid equilibrium (VLE) and liquid-liquid equilibrium (LLE) between H 2 O and a compressed CO 2 -rich phase.…”

“…Modelling studies of the ternary mixtures containing H 2 O and CO 2 are restricted to one study of (H 2 O + CO 2 + N 2 ) at T ≤ 373 K, including both LLE and VLE regions. In summary, previous applications of SGT or LGT have involved either a correlative approach for binary systems [14,25,30,33], or use of an ad hoc density-dependent form of the influence parameter [26,35,36], or have been restricted to narrow ranges of temperature and pressure [35]. Accurate predictive results have been obtained with DFT [31] but, as mentioned above, this approach is computationally too demanding for application to multicomponent systems.…”

Seismic chimneys in the Southern Viking Graben – Implications for palaeo fluid migration and overpressure evolution

“…γ wc is the interfacial tension coefficient for Methane and water at 8.5 MPa and 48 • C (∼ 62 × 10 −3 N/m; Khosharay and Varaminian, 2013), which represents the pressure and temperature condition at the top of the Utsira Formation (Alnes et al, 2011). According to this equation, the capillary entry pressure for methane P wm entering the Nordland Shales should be around 2.55 MPa under Utsira Formation conditions.…”