Improving Cubic Equations of State for Heavy Reservoir Fluids and Critical Region

Experimental investigation on the effect of addition of amine activators to aqueous solutions of N-methyldiethanolamine on the rate of carbon dioxide absorption

“…The compressibility factors in Eqs. (1) and (2) are calculated by the modified Peng-Robinson equation of state proposed by Feyzi et al (1998). At each time t, the number of absorbed gas molecules can be calculated by Eq.…”

Equation of State’s Crossover Enhancement of Pseudopotential Lattice Boltzmann Modeling of CO2 Flow in Homogeneous Porous Media

“…As in [22], we assume that T c = T crit and therefore, ∆τ crit = 0. Another important parameter in Equations ( 17) and ( 18) is a crossover function, Y, that accounts for volumetric changes in the EoS depending on how far the system is from the critical region.…”

“…In addition, most studies apply classical EoS to analyze the thermodynamic properties of the fluid in different ranges of temperature [9,[15][16][17]. Though classical cubic EoS predict well the fluid properties away from the critical region, they fail to accurately capture the fluid behavior in the near-critical region or at a supercritical state because of long-scale fluctuations in density that cover a wide range of temperatures [1,[18][19][20][21][22]. In this region, analytical solutions provided by classical EoS are no longer accurate.…”

Crossover Peng-Robinson equation of state with introduction of a new expression for the crossover function

“…Although PR EOS has found a wide range of applications in thermodynamic calculations, its prediction in the critical region is due to serious errors. Feyzi et al [16] have modified PR EOS in the critical region and obtained accurate results for the critical compressibility factor but their proposed modification is not a continuous function of temperature inside and outside the critical region.…”