Abstract A pore-network modeling approach is proposed to understand mineral dissolution regimes during reactive transport, as well as changes in porosity and permeability. The transport problem is implemented with full consideration of the mass balance of the solute in all pore spaces, including pore-bodies and throats. The changes in geometry of the pore network due to calcite dissolution are taken into account based on the rate of the heterogeneous chemical reaction happening at the mineral surface. The networks consider two- and three-dimensional domains with a variety of number of pores. The evolution of network geometry and flow properties are investigated under various flow conditions using representative Peclet and Damkohler numbers to understand the interplay of transport and reaction. A behavior diagram is constructed aiming to identify different regimes and their boundaries. The dissolution patterns identified in this study further the applicability of the pore-network model approach as a tool for understanding of reactive transport and dissolution processes.

中文翻译：

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单相反应输运和溶解模式评估的孔隙网络建模

摘要 提出了一种孔隙网络建模方法，以了解反应输运过程中的矿物溶解机制，以及孔隙度和渗透率的变化。传输问题的实施充分考虑了所有孔隙空间中溶质的质量平衡，包括孔体和喉道。根据矿物表面发生的非均相化学反应的速率，考虑了由于方解石溶解引起的孔隙网络几何形状的变化。这些网络考虑了具有多种孔隙数量的二维和三维域。使用代表性 Peclet 和 Damkohler 数在各种流动条件下研究网络几何形状和流动特性的演变，以了解传输和反应的相互作用。构建行为图旨在识别不同的制度及其边界。本研究中确定的溶解模式进一步证明了孔隙网络模型方法作为理解反应传输和溶解过程的工具的适用性。