Effects of Pore Scale Mixing on Reactive Transport

本研究的目的是提高对反应性输运的基本认识，并最终应用于有害废物场地的修复过程和管理与监管。一个特定的目标是确定孔隙尺度混合对反应输运的影响。本研究的具体目标是：(1)确定局部速度、孔隙几何形状和反应速率常数对均质孔隙网络中反应程度的影响；(2)确定局部速度、孔隙几何形状和反应速率常数对非均质孔隙网络中反应程度的影响；(3)建立关系，允许在连续尺度上考虑孔隙尺度混合对反应输运的影响。微模型实验和晶格-玻尔兹曼（LB）模拟的结合将用于量化这些现象。LB方法是一种基于动力学理论的数值计算方法，用于求解复杂孔隙结构中的水动力和扩散输运问题。＊＊＊

0121898 Valocchi The objective of the proposed research is to improve fundamental understanding of reactive transport with the ultimate application to remediation processes and the management and regulation of hazardous waste sites. A particular goal is to determine the effects of pore-scale mixing on reactive transport. The specific objectives of this research are to: (1) determine the effects of local velocity, pore geometry, and reaction rate constant on the extent of reaction in a homogenous pore network, (2) determine the effects of local velocity, pore geometry, and reaction rate constant on the extent of reaction in heterogeneous pore networks, and (3) develop relationships that allow the effects of pore scale-mixing on reactive transport to be accounted for at the continuum-scale. A combination of micromodel experiments and Lattice-Boltzmann (LB) simulations will be used to quantify these phenomena. The LB method is a kinetic theory-based numerical technique for solving hydrodynamic and diffusive transport problems in complex pore structures. ***