“…The viscosity of phase α ∈ {o, g}, µ α = µ α (T, P, n α ), is a function of temperature, T , pressure, P , and phase composition (in moles), n α : We present the expression for V α c here, but we first use it in (B.6). We use values of the pure component critical temperature, T c,k , critical pressure, P c,k , critical volume, V c,k , and molecular weight, M w,k , from the DIPPR database [53]. In order to describe the viscosity of the oil and the gas phases in a unified manner, we have adopted a different notation for the mole fractions, x α k = x α k (n α ), than in previous sections:…”