Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026035 |
Effects of Pore-Scale Heterogeneity on Macroscopic NAPL Dissolution Efficiency: A Two-Scale Numerical Simulation Study | |
Aminnaji, Morteza; Rabbani, Arash; Niasar, Vahid J.; Babaei, Masoud | |
2019-11-10 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | England |
英文摘要 | Interphase mass transfer or dissolution coefficient of nonaqueous phase liquids (NAPL) is an important parameter in predicting the transport of contaminant species in porous media. While the literature offers valuable insights into the dependence of this coefficient on different parameters at the continuum scale (e.g., contaminant saturation and Darcy velocity), effects of pore-scale heterogeneity on macroscopic dissolution coefficient have received little attention. In this work a three-dimensional pore-scale model is developed to simulate interphase mass transfer over different synthetic pore network structures with various pore radii correlation lengths. The pore network modeling simulates dissolution of immobile NAPL into water (single phase) through diffusive throats for the water-NAPL interface. The impacts of pore network spatially correlated heterogeneities, NAPL saturation/distribution, and aqueous phase velocity on NAPL mass transfer coefficient and water-NAPL interfacial surface area are studied. These macroscopic properties are then employed in two-dimensional continuum-scale domains formed by concatenating 20 by 20 pore networks in x and y directions. The results highlight the impact of pore-scale heterogeneity on the distribution of NAPL and subsequently on the dissolution rate (i.e., dissolution coefficient). An uncorrelated distribution of pore radii consistently leads to higher NAPL dissolution coefficient than spatially correlated heterogeneity. The results of continuum modeling show that NAPL dissolution rates are only different between domains formed by correlated and uncorrelated pore networks at very high flow rates and Darcy velocities. However, for typical values of Darcy velocity in groundwater systems, variation in mass transfer coefficient due to pore-scale heterogeneity is minimal for efficient mass removal. |
英文关键词 | soil remediation NAPL dissolution pore network modeling spatially correlated heterogeneity mass transfer coefficient upscaling |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000495506900001 |
WOS关键词 | NONAQUEOUS-PHASE-LIQUID ; DISTRIBUTED IMMISCIBLE LIQUID ; CONTAMINANT MASS DISCHARGE ; SOURCE-ZONE ; POROUS-MEDIA ; CAPILLARY-PRESSURE ; INTERFACIAL AREA ; TRANSFER COEFFICIENTS ; NETWORK SIMULATION ; TRACER DISPERSION |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
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/223881 |
专题 | 资源环境科学 |
作者单位 | Univ Manchester, Dept Chem Engn & Analyt Sci, Manchester, Lancs, England |
推荐引用方式 GB/T 7714 | Aminnaji, Morteza,Rabbani, Arash,Niasar, Vahid J.,et al. Effects of Pore-Scale Heterogeneity on Macroscopic NAPL Dissolution Efficiency: A Two-Scale Numerical Simulation Study[J]. WATER RESOURCES RESEARCH,2019. |
APA | Aminnaji, Morteza,Rabbani, Arash,Niasar, Vahid J.,&Babaei, Masoud.(2019).Effects of Pore-Scale Heterogeneity on Macroscopic NAPL Dissolution Efficiency: A Two-Scale Numerical Simulation Study.WATER RESOURCES RESEARCH. |
MLA | Aminnaji, Morteza,et al."Effects of Pore-Scale Heterogeneity on Macroscopic NAPL Dissolution Efficiency: A Two-Scale Numerical Simulation Study".WATER RESOURCES RESEARCH (2019). |
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