Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026993 |
Lagrangian modeling of mixing‐limited reactive transport in porous media: multi‐rate interaction by exchange with the mean | |
Guillem Sole‐; Mari; Daniel Fernà; ndez‐; Garcia; Xavier Sanchez‐; Vila; Diogo Bolster | |
2020-06-02 | |
发表期刊 | Water Resources Research
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出版年 | 2020 |
英文摘要 | The presence of solute concentration fluctuations at spatial scales much below the scale of resolution is a major challenge for modeling reactive transport in porous media. Overlooking small‐scale fluctuations, which is the usual procedure, often results in strong disagreements between field observations and model predictions, including, but not limited to, the overestimation of effective reaction rates. Existing innovative approaches that account for local reactant segregation do not provide a general mathematical formulation for the generation, transport and decay of these fluctuations and their impact on chemical reactions. We propose a Lagrangian formulation based on the random motion of fluid particles carrying solute concentrations whose departure from the local mean is relaxed through multi‐rate interaction by exchange with the mean (MRIEM). We derive and analyze the macroscopic description of the local concentration covariance that emerges from the model, showing its potential to simulate the dynamics of mixing‐limited processes. The action of hydrodynamic dispersion on coarse‐scale concentration gradients is responsible for the production of local concentration covariance, whereas covariance destruction stems from the local mixing process represented by the MRIEM formulation. The temporal evolution of integrated mixing metrics in two simple scenarios shows the trends that characterize fully‐resolved physical systems, such as a late‐time power‐law decay of the relative importance of incomplete mixing with respect to the total mixing. Experimental observations of mixing‐limited reactive transport are successfully reproduced by the model. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/273336 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Guillem Sole‐,Mari,Daniel Fernà,等. Lagrangian modeling of mixing‐limited reactive transport in porous media: multi‐rate interaction by exchange with the mean[J]. Water Resources Research,2020. |
APA | Guillem Sole‐.,Mari.,Daniel Fernà.,ndez‐.,Garcia.,...&Diogo Bolster.(2020).Lagrangian modeling of mixing‐limited reactive transport in porous media: multi‐rate interaction by exchange with the mean.Water Resources Research. |
MLA | Guillem Sole‐,et al."Lagrangian modeling of mixing‐limited reactive transport in porous media: multi‐rate interaction by exchange with the mean".Water Resources Research (2020). |
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