Thermo- and fluid-dynamical modelling of two-phase multi-component carbon dioxide mixtures

A method for calculating the transport and depressurization of a two-phase multi-component CO2 mixture is presented. The thermodynamical and transport properties for a CO2–CH4 mixture are calculated using the Soave–Redlich–Kwong equation of state (SRK). The fluid flow is described by a drift-flux model, which is solved using the multi-stage (MUSTA) centred scheme. Numerical results are shown, illustrating the effect of mixture composition and the feasibility of the approach.