Article
Engineering, Chemical
Mubarak Khlewee, William J. DeSisto, Douglas W. Bousfield
Summary: Understanding the dynamic fluid flow in a porous media with temperature changes is important for various applications. This study developed a model based on Darcy's law to quantify the penetration of hot melt adhesive into paper and proposed a model that considers process and material parameters. Experiments were conducted to validate the model, and the results showed good agreement. The permeability of the coating layer and the paper temperature were identified as key parameters influencing penetration depth.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Mechanics
Mojdeh Rasoulzadeh
Summary: This study investigates the transport of nonreactive tracers in a binary porous medium with randomly packed ellipse fluid-filled cavities. Anomalous transport behaviors, including early arrival time and long tailing, are observed due to the high contrast in medium properties and complex fluid velocity structure. The researchers quantify the transport features using a particle tracking method and propose a continuous time random walk (CTRW) framework to represent an upscaled model. Several key parameters, including cavity aspect ratio, porous background permeability, and the Peclet (Pe) number, are found to have significant effects on the anomalous transport process.
Article
Engineering, Civil
Albert Kwame Kwaw, Zhi Dou, Jinguo Wang, Xueyi Zhang, Yongqiang Chen
Summary: This study reveals that bound water plays a significant role in the non-Fickian transport of solute in porous media. As the content of bound water increases, the non-Fickian characteristics become stronger. The immobile water fraction of the MIM model and the solute transport velocity in the CTRW model both increase with increasing bound water content, while the mass transfer rate coefficient in the MIM model and the power law exponent in the CTRW model both decrease. Porous media with bound water content below 16.4% exhibit moderately non-Fickian solute transport, while those with bound water content equal to or greater than 16.4% exhibit highly non-Fickian solute transport.
JOURNAL OF HYDROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Yuehongjiang Yu, Chuanxi Wang, Junning Liu, Sheng Mao, Yashar Mehmani, Ke Xu
Summary: Bubbles in subsurface porous media coarsen to reduce free energy and this process significantly impacts various geophysical problems. The coarsening kinetics in porous media deviate from classical theory due to quantization of space and re-scaling of mass transfer coefficient. A new coarsening theory is proposed and validated through numerical simulations. This work enhances the understanding of complex fluid behaviors in subsurface environments.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Civil
Ying-Fan Lin, Junqi Huang, Elliot J. Carr, Tung-Chou Hsieh, Hongbin Zhan, Hwa-Lung Yu
Summary: Groundwater is crucial for providing fresh water, but it is highly vulnerable to pollution. Understanding the dynamics of solute transport in groundwater and soils is essential for predicting the distribution of contaminants. In this research, we propose a new approach based on the temporally relaxed theory of Fick's Law, which introduces two relaxation times to account for solute particle collisions and attachment. Our findings show that the relaxation times have similar properties to the transport parameters in conventional models, and our solution accurately predicts transport parameters from soil column experiments. Importantly, we discovered that the relaxation times are proportional to the magnitude of Peclet number, providing deeper insight into solute transport and groundwater contamination.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Richard A. Pauloo, Graham E. Fogg, Zhilin Guo, Christopher V. Henri
Summary: This study investigates the regional-scale transport processes in heterogeneous geology and demonstrates the effects of vertical anisotropy in K and seasonal pumping and recharge on non-Fickian transport. Alterations to hydraulic gradients can lead to transitions in transport patterns from non-Fickian to more Fickian.
WATER RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Yihan Li, Jianmin Bian, Qian Wang, Tiesong Li
Summary: Media and hydrodynamic conditions are two important factors affecting solute transport and non-Fickian transport. CTRW can effectively describe the non-Fickian phenomenon in solute transport better than ADE. The parameter beta in CTRW simulation reflects the degree of non-Fickian diffusion in solute transport.
Article
Water Resources
Ranit Monga, Oliver Brenner, Daniel W. Meyer, Patrick Jenny
Summary: This study developed a simplified Lagrangian approach to characterize and predict advective transport in 2-D domains with fractures. By performing Monte Carlo simulation, key correlation structures in the displacement step coordinates were identified. A correlated random walk model was derived, which accurately reproduces macrodispersion.
ADVANCES IN WATER RESOURCES
(2022)
Article
Physics, Multidisciplinary
Vinay Kumar, Somanchi V. S. S. N. V. G. Krishna Murthy, B. V. Rathish Kumar
Summary: This study assesses the mathematical model for entropy generation in free convective heat and mass transfer in a non-Darcy porous domain, utilizing the finite element method to solve the nonlinear partial differential equations. The results show that increased thermal buoyancy forces lead to higher fluid flow stratification levels, while horizontally applied magnetic forces significantly restrict convective flow of heat and mass fluxes.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Computer Science, Interdisciplinary Applications
Federico Municchi, Nicodemo Di Pasquale, Marco Dentz, Matteo Icardi
Summary: The study implements the MRMT model in OPENFOAM library for mobile-immobile transport in porous media. The model is flexible for spatial variation and has been verified and tested on different permeability fields, showing the significant role of heterogeneity in mass transfer.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Thermodynamics
Zhi Dou, Xueyi Zhang, Chao Zhuang, Yun Yang, Jinguo Wang, Zhifang Zhou
Summary: This study investigates the mass transfer of solutes through residual unsaturated porous media. The results show that the variation in residual saturation has a significant influence on the velocity spatial variability and breakthrough curves of aqueous tracer in the residual flow field. Different characteristics of solute transport are observed in different ranges of saturation, and the dispersivity of the mobile domain and the solute exchange between the mobile and immobile domains both contribute to the overall dispersivity.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Multidisciplinary Sciences
Felix J. Meigel, Thomas Darwent, Leonie Bastin, Lucas Goehring, Karen Alim
Summary: This study investigates dispersive transport through complex media and reveals the nonlinear dependence between microscopic morphology and macroscopic transport characteristics by studying the statistics of pore-junction units. It is of great significance for understanding and controlling transport in complex media.
NATURE COMMUNICATIONS
(2022)
Article
Mechanics
Vinay Kumar, S. V. S. S. N. V. G. Krishna Murthy, B. V. Rathish Kumar
Summary: This article extends the study of chemical reaction and heat generation effects on magnetohydrodynamic free convection to include entropy generation analysis for engineering applications. The research establishes a novel flow dynamics model for natural convection in a doubly stratified fluid filled porous enclosure under a uniform magnetic field. Additionally, new heat and mass flux models are proposed to capture the transport of heat and mass fluxes, along with a new entropy generation model and an advanced irreversibility characterization using the Bejan number.
Article
Thermodynamics
Mohammad Sedghi-Asl, Eric Morales-Casique, Seyed Majid Hassanizadeh
Summary: This study numerically investigates the behavior of flow and transport through a high-porosity porous medium. The simulation results, obtained by solving the Navier-Stokes equations and advection-diffusion equations, show that the flow behavior is non-linear and partially turbulent, while the transport behavior is approximately Fickian. The presence of dead-end pores is identified as the main factor influencing the transport behavior.
JOURNAL OF POROUS MEDIA
(2023)
Editorial Material
Engineering, Chemical
H. J. Xu, Q. G. Zhang, G. Debenest
Summary: This special issue evaluates papers on coupling problems for adsorption, absorption, and thermochemical transport in porous media, and also invites scholars to submit latest research findings in numerical models, molecular studies or experimental studies. The submissions developed existing models or methods, highlighting critical engineering problems in 'Adsorption, Absorption and Thermochemical Transport Processes in Complex Porous Structures' for publication in Transport in Porous Media.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Urology & Nephrology
Tal Amitay-Rosen, Yaniv Shilo, Ishai Dror, Brian Berkowitz
Summary: The choice of stent diameter and single/tandem configuration has little impact on renal pressure under extrinsic ureteral obstruction and stent occlusion. Stent failure rate is independent of stent diameter or configuration, and may decrease for larger diameter stents or tandem configurations.
JOURNAL OF ENDOUROLOGY
(2022)
Article
Environmental Sciences
Aaron Brewer, Ishai Dror, Brian Berkowitz
Summary: Rare earth elements (REEs) from electronic waste (E-waste) may pose a threat of environmental pollution, but in most cases, the mobility of REEs in the environment is low, with only release observed under acidic conditions. The presence of natural or anthropogenic nanoparticles may influence the behavior of REEs during leaching and transport.
Article
Environmental Sciences
Javad Shokri, Omar E. Godinez-Brizuela, Hamidreza Erfani, Yongqiang Chen, Masoud Babaei, Brian Berkowitz, Vahid Niasar
Summary: This study used optical imaging to investigate two-phase drainage in a heterogeneous micromodel under different injection rates and flow directions, and found that the capillary pressure-saturation relationship near a heterogeneity interface deviates from conventional models. The initial findings highlight the gaps in the understanding of upscaling capillary pressure in heterogeneous porous materials, and indicate that the discontinuity in saturation is more pronounced in the fine-to-coarse direction.
WATER RESOURCES RESEARCH
(2022)
Article
Urology & Nephrology
Igal Shpunt, Etay Elbaz, Yuval Avda, Jonathan Modai, Dan Leibovici, Brian Berkowitz, Yaniv Shilo
Summary: This study compared the risk factors for surgical intervention in patients with proximal ureteral stones (PUS) who underwent primary intervention versus expectant management. The findings showed that stone size and platelet count were significant risk factors for surgical intervention in patients with up to 10mm PUS.
Article
Urology & Nephrology
Ishai Dror, Talia Harris, Vyacheslav Kalchenko, Yaniv Shilo, Brian Berkowitz
Summary: Magnetic resonance imaging demonstrates that urine flow in stents is minimal when there is no external obstruction, but becomes significant in the presence of an extrinsic ureteral obstruction. The flow within the stent lumen near the obstruction is particularly important.
INTERNATIONAL JOURNAL OF UROLOGY
(2022)
Article
Chemistry, Multidisciplinary
Nitai Amiel, Ishai Dror, Brian Berkowitz
Summary: There is growing concern about the increasing use of rare earth elements (REEs) in new technologies and products and how this may lead to their release into the environment as contaminants. This study conducted a set of experiments to investigate the adsorption and transport of three representative REEs (La, Gd, and Er) in quartz sand media. The results show that the mobility and retention of REEs are influenced by the formation of REE-HA complexes in the solution, which increases with higher concentrations of humic acid (HA) and solution pH. Gadolinium was found to be the most mobile among the REEs, followed by Er and La. Increasing HA concentrations inhibited the retention of REEs in both batch adsorption and column experiments. The co-adsorption of REEs and HA on the sand was observed, with the attachment of elongated regions containing high concentrations of REEs and HA. Modelling of the column experiments revealed that attachment over time was dominant at high HA concentrations, while both time-dependent and spontaneous attachments played equal roles at lower HA concentrations.
Article
Urology & Nephrology
Tal Amitay-Rosen, Ishai Dror, Yaniv Shilo, Brian Berkowitz
Summary: This study aims to quantify the amount of external and internal encrustation in representative ureteral stents, investigate their correlations, mineral structure, and chemical composition, and explore the potential impact of stent lumen encrustation on stent functioning. The findings reveal that significant stent lumen encrustation can occur, even when the external stent wall is free of encrustation.
RESEARCH AND REPORTS IN UROLOGY
(2022)
Article
Environmental Sciences
Ilan Ben-Noah, Shmulik P. Friedman, Brian Berkowitz
Summary: Gas saturation degree and flow patterns are crucial for modeling and designing multiphase systems. However, predicting gas distribution and flow pattern remains challenging. This study identifies the main factors governing air saturation and flow patterns, showing that the flow pattern is mainly affected by the ratio of viscous to gravitational forces. The meta-analysis also indicates a strong correlation between steady air saturation degree and flow velocity, as well as grain diameter.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Behzad Ghanbarian, Yashar Mehmani, Brian Berkowitz
Summary: This study investigates the influence of pore-wall roughness on contaminant migration through particle tracking simulations and analyzes the resulting arrival time distributions using the CTRW approach. The results show that pore-wall roughness has a significant impact on the parameters t(1) and D, while the Peclet number has a greater impact on v and D.
WATER RESOURCES RESEARCH
(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
Geosciences, Multidisciplinary
Marco Dentz, James W. Kirchner, Erwin Zehe, Brian Berkowitz
Summary: In this study, we investigate anomalous transport in a hydrological catchment system over a 36-year period at kilometer scales. Using spectral analysis, we examine the fluctuation scaling of long-term time series measurements of chloride, a natural passive tracer, for rainfall and runoff. The findings suggest that the scaling behavior can be described by a continuous time random walk (CTRW) based on a power-law distribution of transition times, indicating the presence of two distinct power-law regimes in the overall travel time distribution in the catchment. The CTRW framework provides a means to assess anomalous transport in catchments and its implications for water quality fluctuations.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Obstetrics & Gynecology
Yaniv S. Ovadia, Ishai Dror, Gad Liberty, Hadar Gavra-Shlissel, Eyal Y. Anteby, Stephen Fox, Brian Berkowitz, Efraim Zohav
Summary: This study investigates the relationship between rubidium concentration in amniotic fluid during the second trimester and newborn birthweight in the third trimester. The findings suggest that low rubidium concentrations in midpregnancy are associated with lower birthweight percentile. Therefore, rubidium concentration in amniotic fluid could serve as an important marker for early identification of pregnancy outcomes.
AMERICAN JOURNAL OF OBSTETRICS & GYNECOLOGY MFM
(2023)
Article
Urology & Nephrology
Jonathan Modai, Yaniv Shilo, Dan Leibovici, Ishai Dror, Vyacheslav Kalchenko, Brian Berkowitz
Summary: In this in vitro study, we found that ureteral stents with different diameters have the same effectiveness in draining pus from obstructed kidneys. Therefore, the common perception that larger diameter tubes are more effective in such circumstances should be re-examined.
WORLD JOURNAL OF UROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Brian Berkowitz
Summary: This passage discusses the issue of chemical transport in subsurface geological formations, pointing out that the current models have shortcomings in addressing the heterogeneity of the domain and the unresolved, practically unmeasurable heterogeneities at different scales. It suggests that an explicit consideration of temporal information and the use of measurements at similar scales are necessary to formulate, calibrate, and apply models effectively.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Alexander Sternagel, Ralf Loritz, Brian Berkowitz, Erwin Zehe
Summary: In this study, a method called diffusive pore mixing (DIPMI) is proposed to simulate time-delayed diffusive mixing processes on the pore scale. The results show that diffusive mixing in soils depends on the pore size distribution and specific soil water retention properties. Additionally, non-uniform transport and imperfect subscale mixing in a macroscopically homogeneous soil matrix can lead to steep rise and long tailing of breakthrough curves.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)