There are still many unclear mechanisms in the multiphase reactive flow with solid dissolution processes. In this study, the reactive transport processes coupled with solid dissolution and self-induced multiphase flow in three-dimensional (3D) structures with increasing complexity is studied by developing a 3D computational microfluidic method, which considers multiphase flow, interfacial mass transport, heterogeneous chemical reactions, and solid structure evolution. Solid dissolution diagram in a simple channel in the framework of multiphase flow is proposed, with six coupled multiphase flow and solid dissolution patterns identified and the transition between different patterns discussed. Then, multiphase reactive flow in a porous chip is further studied, and the interesting 3D phenomena are discovered, including enhanced solid dissolution in the middle and enriched bubble generation at the corner along the thickness direction. Considering the importance of reactive surface area, correlations of reactive surface area-porosity-saturation with different dissolution patterns are proposed based on the pore-scale results. Finally, the computational microfluidic model is extended to investigate the multiphase reactive flow in a 3D digital core. Different dissolution patterns are recognized using the local porosity evolution character, and the corresponding pore size distribution and bubble characteristics are deciphered. These findings advance understanding of multiphase reactive transport processes and contribute to improve continuum-scale reactive transport modeling.

中文翻译：

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固体溶解和自诱导多相流反应传输过程的计算微流体


固溶过程的多相反应流的机理仍然有许多不清楚的地方。在这项研究中，通过开发一种 3D 计算微流控方法，研究了复杂性不断增加的三维 (3D) 结构中与固体溶解和自诱导多相流耦合的反应输运过程，该方法考虑了多相流、界面质量传递、非均相化学反应和固体结构演化。提出了多相流框架中简单通道中的固体溶解图，识别了六种耦合的多相流和固体溶解模式，并讨论了不同模式之间的过渡。然后，进一步研究了多孔芯片中的多相反应流，发现了有趣的3D现象，包括沿厚度方向中部固溶增强和角部气泡生成丰富。考虑到反应表面积的重要性，根据孔隙尺度结果提出了反应表面积-孔隙度-饱和度与不同溶解模式的相关性。最后，计算微流体模型被扩展以研究 3D 数字核心中的多相反应流。利用局部孔隙演化特征识别不同的溶解模式，并破译相应的孔径分布和气泡特征。这些发现促进了对多相反应输运过程的理解，并有助于改进连续尺度反应输运模型。