Article
Geochemistry & Geophysics
Haoliang Luo, Damien Jougnot, Anne Jost, Jidong Teng, Luong Duy Thanh
Summary: Determining and monitoring liquid water saturation and permeability in saturated frozen porous media are critical issues in cold regions. This study uses geophysical methods to non-invasively determine and monitor liquid water saturation and permeability in frozen porous media. The proposed model successfully predicts the electrical conductivity of frozen soils using different pore size distributions and provides new possibilities for describing the distribution and dynamics of liquid water in frozen environments using geoelectrical and electromagnetic techniques.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Energy & Fuels
Wataru Yoshimune, Satoshi Yamaguchi, Satoru Kato
Summary: A multimodal approach was used to investigate the oxygen transport resistance of gas diffusion layers (GDLs) for polymer electrolyte fuel cells (PEFCs) under different temperature and humidity conditions. Morphological characterization of GDLs was performed, and the oxygen transport resistance of dry and wet GDLs was directly measured. The impact of water saturation level in GDLs on the oxygen transport properties was also examined.
Article
Engineering, Multidisciplinary
Alixa Sonntag, Arndt Wagner, Wolfgang Ehlers
Summary: This article introduces the phase-field approach in dynamic hydraulic fracturing scenarios using fully saturated porous media, and enhances it by introducing a crack-opening indicator to distinguish open and closed cracks. The existence of pore gas in partially saturated porous media is shown to slow down the fracture evolution. The study is based on continuum mechanics principles and numerical simulations using the Finite-Element Method.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Environmental
Jiuyan Chen, Huiying Zhang, Qiqi Wei, Usman Farooq, Qiang Zhang, Taotao Lu, Xinhai Wang, Weifeng Chen, Zhichong Qi
Summary: Water-soluble aerosol organic matters (WSAOMs) from biomass pyrolysis/burning can significantly enhance the mobility of heavy metal ions and soil colloid-mediated transport in aquatic systems.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Jiang Liu, Felix Kerner, Nicolas Schlueter, Daniel Schroeder
Summary: This study investigates the factors influencing the performance of polymer electrolyte membrane (PEM) electrolyzers, specifically the porous transport layer (PTL). By conducting numerical simulations and calculations, the researchers found that reducing porosity and fiber radii improved interfacial contact and electrical conductivity of the PTL, while decreasing the anisotropy parameters increased electrical conductivity in the through-plane direction. The design of PTLs should be differentiated based on the operating conditions, with lower porosity and fiber radii for nonstarvation conditions and higher porosity, lower anisotropy parameters, and smaller fiber radii for starvation conditions. Graded PTLs with customized porosity, fiber radius, and fiber orientation can enhance structural and transport properties.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Geochemistry & Geophysics
Ilan Ben-Noah, Shmulik P. Friedman, Brian Berkowitz
Summary: The dynamics of air flow in partially water-saturated, porous geological formations are influenced by various forces and parameters. Reliable gas-liquid flow models are important for understanding the role of gases in earth systems and engineering practices involving air injection. However, existing modeling approaches have limitations in capturing the complexity of air flow in wet porous media. Continuum models, such as Darcy's law, are suitable for single-phase flow in saturated media but not for two-phase flow. Pore-scale models require extensive computational efforts and lack accessible details on medium characteristics. Stochastically-based representations show limited success in interpreting phase configurations and saturation degrees.
REVIEWS OF GEOPHYSICS
(2023)
Article
Engineering, Environmental
Jinni Yao, Hainan Wang, Chengxue Ma, Yu Cao, Wanpeng Chen, Li Gu, Qiang He, Caihong Liu, Jiaming Xiong, Jun Ma, Xiaoliu Huangfu, Hongxia Liu
Summary: The study found that plastic particles have different effects on the transport of Tl(I) under different conditions, considering factors such as pH values and the competitive adsorption of nanoplastics in soil.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Geosciences, Multidisciplinary
Nguyen Van Nghia A., Damien Jougnot, Luong Duy Thanh, Phan Van Do, Tran Thi Chung Thuy, Dang Thi Minh Hue, Nguyen Manh Hung
Summary: This study develops a model to predict the permeability of porous media saturated by one or two fluid phases using a fractal upscaling technique. The model takes into account microstructural properties such as fractal dimension and porosity, and performs well compared to existing models.
HYDROGEOLOGY JOURNAL
(2021)
Article
Environmental Sciences
Xinyao Ye, Zhou Cheng, Ming Wu, Yanru Hao, Bill X. Hu, Cehui Mo, Qusheng Li, Lei Xiang, Haiming Zhao, Jianfeng Wu, Jichun Wu, Guoping Lu
Summary: This study investigates the transport kinetics of polystyrene nanoparticles (PSNPs) in porous media and explores the effect of ion concentration on their mobility. Experiment and numerical model results show that PSNPs are easily adsorbed on the surface of the media when the concentration of Na+ increases, while the mobility of PSNPs is reduced. Similarly, an increase in Ca2+ concentration also decreases the mobility of PSNPs. The study further establishes a correlation between PSNPs mobility and DLVO energy barriers.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2022)
Article
Construction & Building Technology
Zushi Tian, Hailong Ye
Summary: Electrical resistivity is a key indicator for evaluating the mass transport properties of cementitious materials. The results show that the electrical conductivity of AAS is influenced by pore structure and conductivity of pore solution, and the incorporation of sodium nitrite can improve the resistivity of AAS and OPC pastes.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Environmental Sciences
Haojing Zhang, Ruoyu Zhang, Taotao Lu, Wei Qi, Yuwei Zhu, Minghua Lu, Zhichong Qi, Weifeng Chen
Summary: LMWOAs can interact with heavy metal ions and affect their mobility in porous media. The stability constants of metal-LMWOA complexes play a crucial role in the enhanced transport of heavy metal ions. The complex stability can serve as an indicator to quantify and predict the impact of LMWOAs on heavy metal mobility.
Article
Geochemistry & Geophysics
Santiago G. Solazzi, Luong Duy Thanh, Kayian Hu, Damien Jougnot
Summary: This study introduces a novel flux averaging approach to estimate the frequency-dependent effective excess charge density in partially saturated porous media. The upscaling method based on pore-scale physics shows promising results and could be applied to interpret electrokinetic signals in geological formations.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Engineering, Environmental
Guillermina J. Gentile, Maria D. Blanco Fernandez, Maria M. Fidalgo de Cortalezzi
Summary: The study investigated the effects of P25 TiO2 nanoparticles on the transport of bacteriophage PP7 in saturated porous media. It was found that in co-transport experiments, retention of the virus increased and retention of TiO2 nanoparticles decreased under high viral content due to heteroaggregation among colloids, electrostatic interactions, and ripening. The interparticle interactions were successfully modeled by DLVO theory, highlighting the electrostatic nature of the interactions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Gang Cao, Jiaxue Sun, Menghua Chen, Huimin Sun, Guilong Zhang
Summary: The study found that ball-milled biochar has strong transport capacity under conditions of high flow velocity, large medium size, high pH, and low ionic strength, and exhibits strong adsorption to Cd2+. The presence of Cd2+ slightly inhibits BMBC transport, but BMBC also facilitates the transport of Cd2+ due to its high affinity.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Geological
Wei Sun, Jacob Fish, Fushen Liu, Yi Lu
Summary: In this paper, a stabilized two-phase PD-FEM coupling approach is developed for simulating deformation and fracture propagation in partially saturated porous media. The method couples two discretized layers to accurately capture the deformation and fracture of the solid phase and the flow of fluids. Variables related to capillary pressure are incorporated into the model through experimentally determined functions.