A simple explicit thermodynamic closure for multi-fluid simulations including complex vapor–liquid equilibria: Application to NH3-H2O mixtures

This paper presents a new thermodynamic closure formulation appropriate for the simulation of subcritical multiphase flows, where two liquid/vapor components need to be considered, in addition of an arbitrary number of perfect gas non-condensable components. Assuming each component to follow the Noble-Abel Stiffened Gas (NASG) equation of state allows to derive a fully explicit formulation for the mixture pressure. A matching phase transition solver is then proposed to compute efficiently and accurately the thermochemical equilibrium of the said mixture. The model capabilities are then illustrated through a two-dimensional simulation of a liquid ammonia tank leak into 80%-saturated humid air, where water is found to significantly condensate when interacting with the ammonia jet.

J. Carmona, I. Raspo, V. Moureau, P. Boivin. A simple explicit thermodynamic closure for multi-fluid simulations including complex vapor–liquid equilibria: Application to NH3-H2O mixtures. International Journal of Multiphase Flow, 2025, 182, pp.105044. ⟨10.1016/j.ijmultiphaseflow.2024.105044⟩. ⟨hal-05007303⟩

Journal: International Journal of Multiphase Flow

Date de publication: 01-01-2025

Auteurs:
  • J. Carmona
  • I. Raspo
  • V. Moureau
  • P. Boivin



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