The multi-component reactive transport model is widely used in contaminant transport, water-rock interaction, and other earth science fields. Since its complexity lies in its solution, a decoupling approach is used to simplify the model to enhance computational efficiency. A decoupling approach is presented for heterogeneous media, and used to solve the model in this situation. The whole domain is divided into several sub-domains due to the different reactions which may occur and the corresponding component matrix was obtained. The boundary between sub-domains could be divided into two parts, inflow and outflow, which are defined as the Neumann condition and the Dirichlet one, and the concentration of the latter could be calculated by the component in the adjacent sub-domain. Then the models in each sub-domain can be connected and solved. Taking a heterogeneous porous media as an example in which permanganate is partially dissolved during the process, firstly the result obtained by this method without considering porosity variation is compared to that from PHAST: good agreement is achieved, then while considering the change of porosity caused by the dissolution of the permanganate, the flow field, species concentration and porosity of the whole domain and typical sections and points during the reaction are analysed. It is concluded that: the decoupling approach to heterogeneous media is appropriate, and the results from the model could reflect the variation of physical fields due to groundwater in heterogeneous media.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jconhyd.2014.07.009 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Nanoscale Probing of the Organic Binder in Artists' Paint Layers: Organic Phases and Chemical Heterogeneity.
ACS Appl Mater Interfaces
January 2025
Department of Chemistry and Industrial Chemistry, Università di Pisa, via Moruzzi 13, 56124 Pisa, Italy.
Understanding paint structures at the nanoscopic level can address key questions related to artistic techniques, paint formulation, and long-term preservation of artworks. This involves examining spatial chemical complexity, the formation of molecular networks, and interactions between organic and inorganic constituents. Depending on the paint preparation methods, proteins and drying oils, the most common binders in traditional artistic practices, can be integrated to produce paints with diverse structures and nanoscale chemical intricacies.
View Article and Find Full Text PDFDetection of aflatoxin B level and revelation of its dynamic accumulation process using visible/near-infrared hyperspectral and microscopic imaging.
Int J Food Microbiol
January 2025
Beijing Key Laboratory of Optimization Design for Modern Agriculture Equipment, College of Engineering, China Agriculture University, Beijing 100083, China.
Understanding and controlling the dynamic process of aflatoxin B (AFB) accumulation by Aspergillus flavus (A. flavus) remains challenging. In this study, the A.
View Article and Find Full Text PDFInertial Memory Effects in Molecular Transport Across Nanoporous Membranes.
Membranes (Basel)
January 2025
Vinca Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovica Alasa 12-14, P.O. Box 522, 11001 Belgrade, Serbia.
Nanoporous membranes are heterogeneous structures, with heterogeneity manifesting at the microscale. In examining particle transport through such media, it has been observed that this transport deviates from classical diffusion, as described by Fick's second law. Moreover, the classical model is physically unsustainable, as it is non-causal and predicts an infinite speed of concentration perturbation propagation through a substantial medium.
View Article and Find Full Text PDFToward an Efficient Differentiation of Two Strains Through Mass Spectrometry for Fungal Biotyping.
Curr Issues Mol Biol
January 2025
Laboratorio de Bioorgánica Tropical, Facultad de Ciencias Naturales, Exactas y Tecnología, Universidad de Panamá, Panamá 0824, Panama.
Considering that fungi display a great morphological, ecological, metabolic, and phylogenetic diversity, their taxonomic identification is extremely important because it helps us establish important information about each species and its possible biochemical and ecological roles. Traditionally, the identification of fungi at the species level has been carried out with molecular tools such as DNA sequencing, but it still represents a huge challenge today due to the heterogeneity of the fungal kingdom, making the task of identification a complex and difficult process. Biotyping, a type of chemotaxonomy, has been developed in the field of the identification/differentiation and classification of micro-fungi through tools such as mass spectrometry (MS).
View Article and Find Full Text PDFRegulating gypsum scaling-induced wetting in membrane distillation by heterogeneous crystallization: Role of filter media.
Water Res
January 2025
Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA.
Mineral scaling and scaling-induced wetting are critical issues in membrane distillation (MD) during treatment of saline wastewaters. Gypsum scaling and scaling-induced wetting in MD were successfully regulated by heterogeneous crystallization with in-line granular filtration in this study. Stable water recovery increased from 32.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!