Mass Transfer Between Recirculation and Main Flow Zones: Is Physically Based Parameterization Possible?
Mass Transfer Between Recirculation and Main Flow Zones: Is Physically Based Parameterization Possible?
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DOI：
10.1029/2018wr023124
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发表时间：
2019-01
影响因子：
5.4
通讯作者：
Jia‐Qing Zhou;Lichun Wang;Yi‐Feng Chen;M. Cardenas
中科院分区：
文献类型：
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作者：
Jia‐Qing Zhou;Lichun Wang;Yi‐Feng Chen;M. Cardenas
再循环带（RZ）在许多地球物理流中很常见。这些区域在不规则固体边界附近形成，并与主流分离。由于质量可以被捕获，然后从RZ中释放，因此批量传输可以表现出长尾-一种具有挑战性的异常行为。尽管在移动的移动的（MIM）域模型中通过有效交换系数进行了常见的参数化，但在这种情况下，对潜在的RZ传质和保留知之甚少。我们分析了质量传递过程中使用计算解决的流动和二维粗糙裂缝内的运输场。RZs划定了一种新的技术，然后通过量化的传质与主流区的界面。结果表明，一阶传质系数是雷诺数和RZ与整体流之间的速度差的函数。一个分布式的移动的-im移动的模型与直接估计的参数准确地再现了批量异常传输。虽然分布式移动的移动的模型还没有预测性，但其发展表明，涉及RZ的流量的传质系数是物理上有意义的，潜在的可预测性，并有助于阐明局部传质过程中的一般框架内的移动的移动的运输建模。
Recirculation zones (RZs) are common in many geophysical flows. These zones form near irregular solid boundaries and are separate from the main flow. Since mass can be trapped and later released locally from RZs, bulk transport can exhibit long tails—an anomalous behavior that is challenging to predict. The underlying RZ mass transfer and retention in this situation is poorly understood despite common parameterization by effective exchange coefficients in mobile‐immobile (MIM) domain models. We analyzed the mass transfer process using computationally resolved flow and transport fields inside two‐dimensional rough fractures. RZs were delineated by a novel technique followed by quantification of mass transfer across the interface with the main flow zone. The results showed that the first‐order mass transfer coefficient is a function of Reynolds number and velocity difference between the RZ and bulk flow. A distributed mobile‐immobile model with the directly estimated parameters accurately reproduced bulk anomalous transport. While the distributed mobile‐immobile model is not yet predictive, its development showed that mass transfer coefficients for flows involving RZs are physically meaningful, potentially predictable, and useful for elucidating local mass transfer processes within the general framework of mobile‐immobile transport modeling.