Kinetic interface sensitive tracers – Emerging smart tracer techniques for investigating the dynamics of fluid-fluid interfacial area in multiphase porous media systems

本研究的目的是开发一种新的动力学界面敏感（KIS）示踪技术，用于研究和量化流体-流体界面面积（FIFA）的动态演变，使其更接近于现场应用。如支持信中所示，该提案与斯图加特大学当前的SFB1313项目密切相关，并有助于实现他们的目标。这是为了更好地理解界面如何影响多孔介质系统中的流动、输运和变形过程。通过实验室实验和数值模拟，我们的工作旨在量化多孔介质系统中流体-流体和流体-固体界面的动力学如何受到孔隙几何形状、非均质性和裂缝的影响。这项工作涉及开发数学和计算模型，以描述多孔介质系统的有效行为，包括在更小的空间尺度上发生的界面的影响。在这项研究中，我们将开发一种创新的、快速的、准确的技术来测量流体-流体界面面积，量化其动态产生和随时间的演变，我们将评估KIS示踪技术在流体-流体界面面积产生项参数化方面的潜力，这对热力学多相流理论至关重要。这意味着进一步的详细目标如下：-进一步发展当前方法的准确性，并建立KIS TT作为测定毛细管压力-饱和特定界面面积（p_c-S_w-a_wn） （WP1）的表征技术-研究晶粒尺寸和表面粗糙度对毛细管相关界面面积及其界面产生项（WP2.1A）的影响-开发包括FIFA在内的扩展（宏观尺度）界面条件。（WP2.1B）-将KIS示踪剂的应用从一维柱实验扩展到二维（2D）均质和非均质系统，以及隐含的二维流场。（WP2.2A）-扩展毛细管压力-饱和界面条件在二维非均相系统中的应用（WP3）-开发新的概念、数学和数值模型，以便设计实验和解释实验结果(WP3)-通过将数值模型与实验结果进行比较，为数值模型提供验证方法。(WP4)

The aim of this research is to develop the novel kinetic interface sensitive (KIS) tracer technique for studying and quantifying the dynamic evolution of fluid-fluid interfacial area (FIFA) and bring it closer to field application. As indicated in the letters of support, this proposal is closely linked to the current SFB1313 project at University of Stuttgart and contributes to their objectives. That is to improve the understanding how interfaces affect flow, transport and deformation processes in porous-media systems. By means of laboratory experiments and numerical modelling our work will aim at quantifying how the dynamics of fluid-fluid and fluid-solid interfaces in porous media systems are affected by pore geometry, heterogeneity and fractures. The work involves developing mathematical and computational models that describe the effective behaviour of porous-media systems including the effects of interfaces that occur on much smaller spatial scales.In this research we will develop an innovative, rapid, accurate technique for measuring the fluid-fluid interfacial area, the quantification of its dynamic production and evolution with time, and we will assess the potential of the KIS tracer technique in the parametrization of the fluid-fluid interfacial area production term, which is essential for the thermodynamic multiphase flow theories. This implies the following further detailed objectives: - Further development of the accuracy of the current methodology and the establishment of the KIS TT as a characterization technique for the determination of capillary pressure-saturation-specific interfacial area (p_c-S_w-a_wn) (WP1)- Investigation of the impact of grain size and surface roughness on the capillary-associated interfacial area and its interface production term (WP2.1A)- Development of an extended (macro-scale) interface condition including FIFA. (WP2.1B)- Expansion of the application of KIS tracers from one-dimensional column experiments to two-dimensional (2D) homogeneous and heterogeneous systems and, implicitly, 2D flow fields. (WP2.2A)- Application of the extended capillary pressure-saturation interface condition in 2D heterogeneous systems. (WP2.2B)- Development of new conceptual, mathematical and numerical models that allow the design of experiments and the interpretation of the experimental results (WP3)- Provision of a validation method for the numerical models by comparing them with experimental results. (WP4)