Lagrangian simulation of multi-step and rate-limited chemical reactions in multi-dimensional porous media

Lu, Bing-qing1; Zhang, Yong1; Sun, Hong-guang2; Zheng, Chun-miao3

2018

10.1016/j.wse.2018.07.006

Water Science and Engineering   影响因子和分区

1674-2370

2405-8106

Management of groundwater resources and remediation of groundwater pollution require reliable quantification of contaminant dynamics in natural aquifers, which can involve complex chemical dynamics and challenge traditional modeling approaches. The kinetics of chemical reactions in groundwater are well known to be controlled by medium heterogeneity and reactant mixing, motivating the development of particle-based Lagrangian approaches. Previous Lagrangian solvers have been limited to fundamental bimolecular reactions in typically one-dimensional porous media. In contrast to other existing studies, this study developed a fully Lagrangian framework, which was used to simulate diffusion-controlled, multi-step reactions in one-, two-, and three-dimensional porous media. The interaction radius of a reactant molecule, which controls the probability of reaction, was derived by the agent-based approach for both irreversible and reversible reactions. A flexible particle tracking scheme was then developed to build trajectories for particles undergoing mixing-limited, multi-step reactions. The simulated particle dynamics were checked against the kinetics for diffusion-controlled reactions and thermodynamic well-mixed reactions in one-and two-dimensional domains. Applicability of the novel simulator was further tested by (1) simulating precipitation of calcium carbonate minerals in a two-dimensional medium, and (2) quantifying multi-step chemical reactions observed in the laboratory. The flexibility of the Lagrangian simulator allows further refinement to capture complex transport affecting chemical mixing and hence reactions. (c) 2018 Hohai University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Lagrangian framework Chemical reaction Diffusion-limited process Multi-step reactions Interaction radius

ESCI ; EI

英语

其他

National Natural Science Foundation of China[11572112] ; National Natural Science Foundation of China[41330632] ; National Natural Science Foundation of China[41628202]

Water Resources

Water Resources

WOS:000441304000002

EDITORIAL BOARD WATER SCIENCE & ENGINEERING

20183105618816

Aquifers ; Calcium carbonate ; Chemical reactions ; Contrast media ; Diffusion ; Dynamics ; Groundwater resources ; Hydrochemistry ; Hydrogeology ; Lagrange multipliers ; Mixing ; Porous materials ; Precipitation (chemical)

Groundwater:444.2 ; Geology:481.1 ; Geochemistry:481.2 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Materials Science:951

Web of Science

1.Univ Alabama, Dept Geol Sci, Tuscaloosa, AL 35487 USA;
2.Hohai Univ, Coll Mech & Mat, Nanjing 210098, Jiangsu, Peoples R China;
3.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China

Lu, Bing-qing,Zhang, Yong,Sun, Hong-guang,et al. Lagrangian simulation of multi-step and rate-limited chemical reactions in multi-dimensional porous media[J]. Water Science and Engineering,2018,11(2):101-113.

Lu, Bing-qing,Zhang, Yong,Sun, Hong-guang,&Zheng, Chun-miao.(2018).Lagrangian simulation of multi-step and rate-limited chemical reactions in multi-dimensional porous media.Water Science and Engineering,11(2),101-113.

Lu, Bing-qing,et al."Lagrangian simulation of multi-step and rate-limited chemical reactions in multi-dimensional porous media".Water Science and Engineering 11.2(2018):101-113.