Effects of Dissolution Fingering on Mass Transfer Rate in Three‐Dimensional Porous Media
Effects of Dissolution Fingering on Mass Transfer Rate in Three‐Dimensional Porous Media
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DOI：
10.1029/2020wr029353
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发表时间：
2021-09
影响因子：
5.4
通讯作者：
Anindityo Patmonoaji;Yingxue Hu;Muhammad Nasir;Chunwei Zhang;T. Suekane
中科院分区：
文献类型：
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作者：
Anindityo Patmonoaji;Yingxue Hu;Muhammad Nasir;Chunwei Zhang;T. Suekane
在多孔介质中，溶解从截留相向流动相的传质过程存在于各种水文地质过程中。溶解指状现象及其对溶解传质的影响是重要现象之一。在这项工作中，溶解在多孔介质中的质量传递与不同的颗粒尺寸和分布进行了研究，在孔尺度和介观尺度，通过使用X射线显微计算机断层扫描。采用代表性单元体积法测定了比表面积和传质系数，并对溶解指进效应进行了评价。线性不稳定性理论用于预测在溶解指化开始时的溶解指宽度（λ）。虽然当多孔介质容器直径（Ly）小于λ的一半时，溶解指状倾向于发展，但当Ly大于整个λ时，它对传质系数的影响开始出现。从这一点开始，溶解指形使传质系数降低三倍。为了验证，使用更大的多孔介质容器尺寸进行了额外的实验，并成功观察到三个溶出指。他们的大小被发现是可比的线性不稳定性理论的基础上的理论预测。
Dissolution mass transfer from the trapped phase to the flowing phase in porous media occurs in various hydrogeology processes. One of the important phenomena is dissolution fingering and its effect on dissolution mass transfer. In this work, dissolution mass transfer in porous media with various particle sizes and distribution was investigated in pore scale and meso‐scale by using X‐ray microcomputed tomography. The specific interfacial area and mass transfer coefficient were measured by following the representative elementary volume concept, and the effect of dissolution fingering was evaluated. Linear instability theory was used for the prediction of dissolution finger width ( λ ) at the onset of dissolution fingering. Although dissolution fingering tends to develop when the porous media container diameter ( Ly ) is smaller than half of λ , its effect on mass transfer coefficient starts to occur when Ly is larger than the whole λ . Starting this point, dissolution fingering decreases the mass transfer coefficient by three times. For validation, an additional experiment with a larger porous media container size was performed, and three dissolution fingers were successfully observed. Their size was found to be comparable with the theoretical prediction based on linear instability theory.