A New Temperature Evolution Equation that Enforces Thermodynamic Vapour-Liquid Equilibrium in Multiphase Flows - Application to Co2 Modeling

作     者：Kumar, Pardeep Sanderse, Benjamin Rosen Esquivel, Patricio I. Henkes, Ruud A.W.M. 

作者机构：Centrum Wiskunde & Informatica Amsterdam Netherlands Eindhoven University of Technology Eindhoven Netherlands Shell Projects and Technology Amsterdam Netherlands Delft University of Technology Delft Netherlands 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Two phase flow 

摘      要：This work presents a novel framework for numerically simulating the depressurization of tanks and pipelines containing carbon dioxide (CO2). The framework focuses on efficient solution strategies for the coupled system of fluid flow equations and thermodynamic constraints. A key contribution lies in proposing a new set of equations for phase equilibrium calculations which simplifies the traditional vapor-liquid equilibrium (VLE) calculations for two-phase CO2 mixtures. The first major novelty resides in the reduction of the conventional four-equation VLE system to a single equation, enabling efficient solution using a non-linear solver. This significantly reduces computational cost compared to traditional methods. Furthermore, a second novelty is introduced by deriving an ordinary differential equation (ODE) directly from the UV-Flash equation. This ODE can be integrated alongside the governing fluid flow equations, offering a computationally efficient approach for simulating depressurization processes. © 2024, The Authors. All rights reserved.