This paper presents a modeling approach for a class of multiphase chemical systems, based on non-equilibrium thermodynamics, specialized to an open flash-drum system. A compartmental model is considered to establish the dynamics of the gas and liquid phases, while a model of interface transport yields to constraints in the model. The overall system is thus written as a Differential-Algebraic system of Equations (DAE). The derived model is shown to be of index one, for which a stability analysis, based on Lyapunov first method, is briefly developed. An example is presented to illustrate the proposed the modeling and stability analysis approach, together with numerical simulations.
Romo Hernandez, Aaron ; Dochain, Denis ; Hudon, Nicolas ; Ydstie, Birger Erik ; et. al. A Non-equilibrium Approach to Model Flash Dynamics with Interface Transport.In: IFAC Papers-on-Line, Vol. 51, no. 18, p. 874-879