Modeling mass transfer processes for multi-phase flow in porous media including fluid-fluid interfacial areas

多孔介质中的多相流动和输运过程在许多环境、生物和工业系统中起着至关重要的作用。当相组成改变时，即当相之间发生传质时，这些过程特别复杂。众所周知，流体-流体界面在各相之间的传质中起着核心作用。然而，目前，这些接口是缺乏在质量传输理论。此外，几乎所有的宏观尺度数值模型完全忽略界面面积，并假设相之间的热力学平衡，或者使用经验函数进行估计。然而，在过去的几十年中，多孔介质中的两相流的新理论已经被开发出来，其明确地考虑了流体-流体界面，包括没有和有相间质量传递。本项目的目的是首先比较两相模型与相间传质，占界面面积的作用，实验数据。接下来，计划将新理论扩展到三相流和非等温情况。新的平衡方程和本构关系将被实施到一个数值模拟器，并应用到一个例子，二氧化碳储存在一个深地质地层。当储存二氧化碳时，在超临界二氧化碳区域内局部发生的过程比在感兴趣的领域的大部分剩余部分中复杂得多，并且更依赖于精细过程。因此，一个多尺度多物理的方法是设想解决这个问题。

Multi-phase flow and transport processes in porous media play an essential role in many environmental, biological, and industrial systems. These processes are especially complex when the phase composition changes, i.e. when mass transfer between phases takes place. It is well known that fluid-fluid interfaces play a central role in mass transfer among various phases. Nevertheless, currently, these interfaces are absent in mass transport theories. Also, almost all macro-scale numerical models completely ignore interfacial areas and either assume thermodynamic equilibrium between the phases or they use empirical functions for their estimation. However, new theories of two-phase flow in porous media have been developed in the last decades which explicitly account for the fluid–fluid interfaces, both without and with interphase mass transfer. The aim of this project is to first compare a two-phase model with interphase mass transfer, accounting for the role of interfacial area, to experimental data. Next, it is planned to extend the new theories to three-phase flow and non-isothermal situations. The new balance equations and constitutive relationships will be implemented into a numerical simulator and applied to an example of carbon dioxide storage in a deep geological formation. When storing carbon dioxide, processes occurring locally within the regions of supercritical carbon dioxide are much more complex and much more dependent on finescale processes than in the large remaining part of the domain of interest. Therefore, a multi-scale–multi-physics approach is envisaged for the solution of this problem.