title: Continuous time random walk in homogeneous porous media.
abstract: Continuous time random walk (CTRW) has been successfully applied in the description of anomalous transport in porous media in recent years. We simulate solute transport in randomly packed spheres with the same diameter and use CTRW to analyze the simulated results. From analysis, we find that there exists weak anomalous transport in the approximately homogeneous porous media. The anomaly becomes more apparent with the increase of Pe. This conclusion consists with previous simulations in two-dimensional homogeneous media and experimental data. We also calculate the trapping probabilities of solute particles in stagnant regions, which could give a physically based explanation for this non-Gaussian behavior.
authors.affiliation: Department of HydroSciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China. Electronic address: jianguo.jiang@gmail.com.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Jiang
authors.forename: Jichun
authors.initials: J
authors.lastname: Wu
mesh_terms: D003198:Computer Simulation; D004784:Environmental Monitoring / Q000379:methods*; D008956:Models, Chemical; D016011:Normal Distribution; D016062:Porosity; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D012996:Solutions / Q000032:analysis / Q000737:chemistry; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D012989:Soil Pollutants; D012996:Solutions; D014874:Water Pollutants, Chemical
keywords: Contaminant transport; Continuous time random walk; Porous media