Computation of steady-state multiple choked compressible flow: an analytical solution for single-phase and two-phase two-component flow

The possibility of multiple choked compressible flow is analysed for the single-phase gas and two-phase two-component mixture. Two basic criteria derived from the global mass and energy balance equations and from the second law of thermodynamics have been established for describing the occurrence of multiple choked flow phenomenon. An analytical computational procedure deduced from these criteria is proposed and applied to the practical case of flows through a discharge line involving several singularities. Comparisons between simulations and experiments performed with pure nitrogen and nitrogen-water mixture show a good agreement. (C) 1998 Elsevier Science Ltd. All rights reserved.