Journal: Transport in Porous Media

Abbreviation

Transp Porous Med

Publisher

Springer

Journal Volumes

ISSN

0169-3913
1573-1634

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Publications 1 - 10 of 65
  • The "Butterfly Effect" in a Porous Slab
    Item type: Journal Article
    Magyari, Eugen (2010)
    Transport in Porous Media
  • Correction to: Relating Darcy-Scale Chemical Reaction Order to Pore-Scale Spatial Heterogeneity
    Item type: Other Journal Item
    Huang, Po-Wei; Flemisch, Bernd; Qin, Chao-Zhong; et al. (2022)
    Transport in Porous Media
  • On the Potential of Tomographic Methods when Applied to Compacted Crushed Rock Salt
    Item type: Journal Article
    Keller, Lukas M.; Jobmann, Michael; Schuetz, Philipp; et al. (2014)
    Transport in Porous Media
    Compacted crushed rock salt is considered as potential backfill material in repositories for nuclear waste. To evaluate the sealing properties of this material knowledge concerning the nature of the pore space is of eminent interest. Here, the pore microstructures of crushed rock salt samples with different compaction states were investigated by X-ray (XCT) computed tomography and Focused Ion Beam nanotomography (FIB-nt). Based on these methods the pore microstructures were reconstructed and quantitatively analyzed with respect to porosity, connectivity and percolation properties. Regarding pores with radii >4μm, porosity differs substantially in the two analyzed samples (𝜙�=0.01 and 0.10). The pore microstructures are considered isotropic in connectivity and percolation threshold. Using two finite-scaling schemes we found percolation thresholds with critical porosities 𝜙�𝑐�>0.05. Based on statistical considerations, the millimeter size samples that can be analyzed by XCT are large enough to provide a meaningful picture of the pore geometry related to macroporosity. The samples contain also a small fraction (i.e. <0.01) of pores with radii <1μm, which were resolved by FIB-nt. Often these pores can be found along grain boundaries. These pores are granular shaped and are not connected to each other. Typical samples size that can be analyzed by FIB-nt is on the order of tens of microns, which turned out to be too small to provide representative geometric information unless an effort is made that involves several FIB-nt realizations per sample.
  • The Role of High-Permeability Inclusion on Solute Transport in a 3D-Printed Fractured Porous Medium: An LIF-PIV Integrated Study
    Item type: Journal Article
    Kong, Xiang-Zhao; Ahkami, Mehrdad; Naets, Isamu; et al. (2023)
    Transport in Porous Media ~ 146
    It is well-known that the presence of geometry heterogeneity in porous media enhances solute mass mixing due to fluid velocity heterogeneity. However, laboratory measurements are still sparse on characterization of the role of high-permeability inclusions on solute transport, in particularly concerning fractured porous media. In this study, the transport of solutes is quantified after a pulse-like injection of soluble fluorescent dye into a 3D-printed fractured porous medium with distinct high-permeability (H-k) inclusions. The solute concentration and the pore-scale fluid velocity are determined using laser-induced fluorescence and particle image velocimetry techniques. The migration of solute is delineated with its breakthrough curve (BC), temporal and spatial moments, and mixing metrics (including the scalar dissipation rate, the volumetric dilution index, and the flux-related dilution index) in different regions of the medium. With the same H-k inclusions, compared to a H-k matrix, the low-permeability (L-k) matrix displays a higher peak in its BC, less solute mass retention, a higher peak solute velocity, a smaller peak dispersion coefficient, a lower mixing rate, and a smaller pore volume being occupied by the solute. The flux-related dilution index clearly captures the striated solute plume tails following the streamlines along dead-end fractures and along the interface between the H-k and L-k matrices. We propose a normalization of the scalar dissipation rate and the volumetric dilution index with respect to the maximum regional total solute mass, which offers a generalized examination of solute mixing for an open region with a varying total solute mass. Our study presents insights into the interplay between the geometric features of the fractured porous medium and the solute transport behaviors at the pore scale.
  • Localized Delivery of Liquid Fertilizer in Coarse-Textured Soils Using Foam as Carrier
    Item type: Journal Article
    Shojaei, Mohammad Javad; Or, Dani; Shokri, Nima (2022)
    Transport in Porous Media
    Agrochemicals and fertilizers are central to modern agriculture and are credited with the large increase of crop yield as a part of the Green Revolution of the 1960's. Timely and targeted fertilizer application to crop root zones enhances effectiveness and reduces unintended release to the environment. This is particularly important for highly mobile liquid fertilizers (e.g., nitrate) that can be mobilized with infiltrating water to bypass root-bearing soil volumes. We report a novel liquid fertilizer delivery method using foam as carrier. The high degree of control and mechanical stability of liquid fertilizer foam (defined dispersed gas bubbles in a continuous liquid phase) injection into coarse soils (most susceptible to preferential flows) is proposed a novel delivery method to targeted root zone volumes at concentrations and geometry that promote uptake and reduces losses. This note and preliminary communication meant to serve a proof of concept report comparing foam and conventional liquid fertilizer applications. The results indicate that foam-delivery reduced fertilizer leaching thus improving its retention in soil for similar flow conditions of liquid delivery. Theoretical estimates suggest that the effects of fertilizer retention could be enhanced in more localized (3-D) injection of foam fertilizers and other agrochemicals thus enhancing agronomic efficiency and reducing environmental risk of contamination.
  • Numerical Model of Chloride Reactive Transport in Concrete—A Review
    Item type: Journal Article
    Guo, Bingbing; Yu, Ruichang; Zhang, Zhidong; et al. (2024)
    Transport in Porous Media
    The study reviews the theoretical models, numerical implementation and practical applications of chloride reactive transport in concrete. Thermodynamic modeling is capable of accurately predicting chloride binding behaviors across the entire concentration range. It also considers the impact of the pH variation in the pore solution. Thus, the reactive transport model, integrating thermodynamic calculations into transport equations, can provide a more comprehensive representation of chloride ingress in concrete. Furthermore, we discuss the effects of water transport and external stresses on chloride reactive transport. In addition to the well-known advection phenomenon, water transport has the ability to alter the effective transport pathway and influence chloride binding reactions. These three influences exhibit typical temporal and spatial characteristics. Capturing the temporal and spatial characteristics in chloride reactive transport model can be achieved by continuously updating the saturation degree and chloride diffusion coefficient at each finite element mesh node. The effect of stress on chloride reactive transport can be categorized into two scenarios based on the response of transport pathway to external loads: (1) high stress levels, which result in the formation of cracks in concrete, and (2) low stress levels, where concrete remains crack-free. Quantitating the influence of stress levels on the transport pathway is crucial for simulating chloride reactive transport.
  • Editorial to the Special Issue: Reactive Transport in Porous Materials: Current Trends and Challenges
    Item type: Other Journal Item
    Zhang, Zhidong; Angst, Ueli; Lothenbach, Barbara; et al. (2024)
    Transport in Porous Media
  • Drying of Porous Media
    Item type: Other Journal Item
    Shokri, Nima; Or, Dani; Weisbrod, Noam; et al. (2015)
    Transport in Porous Media
  • The development of the asymptotic viscous dissipation profile in a vertical free convective boundary layer flow in a porous medium
    Item type: Journal Article
    Rees, D.A.S.; Magyari, E.; Keller, B. (2003)
    Transport in Porous Media
Publications 1 - 10 of 65