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
Environmental Sciences
Henning Wienkenjohann, Biao Jin, Massimo Rolle
Summary: This study investigates the impact of diffusive-dispersive processes on isotope fractionation of organic contaminants in groundwater. Through experiments and simulations at different scales, the study demonstrates the significant influence of diffusive-dispersive processes on isotope signatures of chlorinated ethene plumes.
WATER RESOURCES RESEARCH
(2023)
Article
Physics, Multidisciplinary
Ralf Metzler, Ashish Rajyaguru, Brian Berkowitz
Summary: In this study, we investigate the dynamics of the concentration profile in a one-dimensional, semi-infinite disordered system connected to a reservoir of tracer particles kept at constant concentration. By using the Montroll-Weiss equation and the fractional diffusion equation, we obtain analytical expressions for the concentration profile and derive the tracer flux and breakthrough curve. We demonstrate a long-time power-law behavior for the residual breakthrough curves and compare it with experimental measurements.
NEW JOURNAL OF PHYSICS
(2022)
Article
Pharmacology & Pharmacy
Pawel Rochowski
Summary: This study is based on contradictory experimental results obtained using photoacoustics modalities for a drug donor/acceptor membrane system. The traditional approach failed when analyzing the time-dependent concentration distribution data, leading to the discovery that the mass uptake by the acceptor is influenced by both interfacial and bulk transport processes.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2023)
Article
Chemistry, Multidisciplinary
Qili Hu, Dan Wang, Shuyue Pang, Li Xu
Summary: This work proposes two empirical models based on the logistic and Gompertz functions to predict multicomponent breakthrough curves. The equilibrium loading of each component can be calculated by integrating the measured breakthrough curves, and the effects of model parameters on the curves are investigated. The applicability of the models is validated through experiments, and the fitting quality is evaluated using residual plots and coefficient of determination.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
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
Oceanography
Yu-Kun Qian, Shiqiu Peng, Xixi Wen, Tongya Liu
Summary: This study proposes two new diffusivity diagnostics, local Lagrangian diffusivity and local effective diffusivity, to quantify localized, instantaneous, irreversible mixing. These diagnostics can help explore the interrelations among different mixing models and minimize discrepancies between different estimates.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Gauthier Rousseau, Satoshi Izumoto, Tanguy Le Borgne, Joris Heyman
Summary: Mixing fronts occur when fluids of different chemical compositions come into contact, and they have a significant influence on a wide range of biogeochemical processes in hydrological systems. The stretching of non-uniform flows accelerates diffusive mass transfer by enhancing concentration gradients, which is an important mechanism governing mixing rates in such fronts. In this study, the impact of local dispersion versus diffusion on the properties of steady mixing fronts created by both uniform and non-uniform flows was investigated. Analytical solutions for the concentration profile, mixing scale, and mixing rate across the fronts were derived and validated through numerical simulations and experiments. The findings suggest that local diffusion coupled with flow governs the mixing scale without porous media, while with porous media, the mixing scale grows with dispersion in non-uniform flows. The coupling between flow acceleration and dispersion results in a flow rate independent mixing interface, in contrast to the local diffusion scenario.
WATER RESOURCES RESEARCH
(2023)
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
Physics, Multidisciplinary
David Hartich, Aljaz Godec
Summary: The thermodynamic uncertainty relation constrains the timescale on which a finite system can exhibit anomalous kinetics, establishing a connection between stochastic thermodynamics and the field of anomalous dynamics for further investigations of thermodynamic consistency of anomalous diffusion models.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Fluids & Plasmas
Monica Basilio Hazas, Francesca Ziliotto, Massimo Rolle, Gabriele Chiogna
Summary: This study provides experimental evidence of the relationship between mixing and flow field topology in porous media. The model-based interpretation shows that changes in boundary conditions can affect mixing dynamics and Shannon entropy of tracer distribution. Despite variations in hydrodynamic dispersion coefficients, the mixing dynamics remain stable due to control by the Okubo-Weiss parameter.
Article
Physics, Fluids & Plasmas
Seonkyoo Yoon, Peter K. Kang
Summary: The study investigates how the interplay between channel roughness, inertia, and diffusion controls tracer transport in rough channel flows. It is found that Pe exerts a significant control over first-passage time distributions, while roughness has more evident effects on tracer transport as Re increases. Through extensive numerical simulations and stochastic modeling, anomalous transport is successfully reproduced using an upscaled stochastic model that honors key Lagrangian velocity statistics.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Physics, Multidisciplinary
Alexandre Puyguiraud, Philippe Gouze, Marco Dentz
Summary: The study focuses on the interaction between pore-scale mixing and network-scale advection in porous media, and its impact on hydrodynamic dispersion evolution and behavior. By analyzing the fundamental mechanisms of pore-scale mixing in a Lagrangian framework, a theory is derived to predict anomalous and normal hydrodynamic dispersion based on pore length, velocity distribution, and Peclet number.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Yunqi Shao, Harish Gudla, Daniel Brandell, Chao Zhang
Summary: This study investigates the transport coefficients, particularly the transference number, of electrolyte solutions and their significance in the design of electrochemical energy storage devices. It is found that the neglect of the reference frame leads to discrepancies between experimental and simulation results, but a proper reference frame transformation can greatly improve the agreement. Furthermore, the study highlights the importance of ion mass and ion-ion correlation in the occurrence of negative transference numbers.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Review
Physics, Multidisciplinary
Thomas Andrew Waigh, Nickolay Korabel
Summary: A wide variety of phenomena in cellular and molecular biology involve anomalous transport, which is often heterogeneous in time and space. Single anomalous exponents and generalized diffusion coefficients fail to adequately describe these phenomena, requiring different experimental techniques and theoretical tools for analysis. High throughput analysis techniques and machine learning play important roles in the study of anomalous transport.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Geochemistry & Geophysics
Jacopo Cogorno, Lucien Stolze, Muhammad Muniruzzaman, Massimo Rolle
Summary: This study examines the impact of domain dimensionality on Coulombic interactions between charged species in pore water and surface-solution reactions. The results demonstrate that domain dimensionality directly affects electrostatic interactions between charged aqueous species and surface complexation reactions at the solid-solution interface.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
Massimo Rolle, Marina Albrecht, Riccardo Sprocati
Summary: The study focuses on electromigration and provides experimental evidence on the impact of compound-specific properties on macroscopic electrokinetic transport. The experimental outcomes demonstrate that both compound-specific diffusivity and ion charge affect the transport of selected color tracer plumes.
JOURNAL OF CONTAMINANT HYDROLOGY
(2022)
Article
Engineering, Environmental
Lucien Stolze, Maria Battistel, Massimo Rolle
Summary: This study investigates the oxidative dissolution of natural As-bearing sulfide minerals and the related release of arsenic under flow-through conditions. The results show that pore-water acidity controls the dissolution of sulfide minerals and the release of arsenic. The impact of surface passivation depends on flow velocity and the spatial distribution of reactive minerals.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Lucien Stolze, Massimo Rolle
Summary: This study investigates the coupling of mixing and surface complexation reactions in porous media. Experimental results show that the deprotonation of reactive surfaces depends on hydrodynamic conditions and differs among different porous media. Reactive transport modeling using a dual domain mass transfer formulation and a surface complexation model successfully captures the effects of incomplete mixing and describes the surface complexation mechanisms under different ionic strengths.
JOURNAL OF CONTAMINANT HYDROLOGY
(2022)
Article
Engineering, Environmental
Riccardo Sprocati, Massimo Rolle
Summary: Electrokinetic techniques have great potential for the remediation of contaminated soil and groundwater, but their effectiveness is significantly influenced by physical heterogeneities and pore water chemistry in porous media.
Article
Environmental Sciences
Navid Ahmadi, Michela Acocella, Elisabeth Fries, Klaus Mosthaf, Massimo Rolle
Summary: The study focuses on the coupling between oxygen mass transfer and evaporation at the soil/atmosphere interface. Through experiments and modeling, the effects of external forcing and internal factors on the distribution and transport of oxygen in different conditions are characterized.
WATER RESOURCES RESEARCH
(2022)
Article
Water Resources
Navid Ahmadi, Muhammad Muniruzzaman, Riccardo Sprocati, Katharina Heck, Klaus Mosthaf, Massimo Rolle
Summary: This study presents a modeling approach to simulate non-isothermal multiphase flow and multicomponent reactive transport in the subsurface/atmosphere interface. The approach couples porous medium and free flow domains to investigate the interaction between flow, mass and heat transport, and geochemical reactions.
ADVANCES IN WATER RESOURCES
(2022)
Article
Electrochemistry
Ruben Lopez-Vizcaino, Virginia Cabrera, Riccardo Sprocati, Muhammad Muniruzzaman, Massimo Rolle, Vicente Navarro, Angel Yustres
Summary: Electrokinetic techniques are advantageous for enhancing transport phenomena and remediating low permeability soils. This study proposes a modeling approach to simulate electrokinetic transport in double porosity media, explicitly considering the effects of electromigration and the electrical diffuse layer. The comparison of results between synthetic cases in single and double porosity systems highlights the significant influence of microstructural modeling.
ELECTROCHIMICA ACTA
(2022)
Article
Environmental Sciences
Andrea Gallo, Riccardo Sprocati, Massimo Rolle, Rajandrea Sethi
Summary: The use of electrokinetics shows great potential in remediation of contaminants in low-permeability porous media. This study experimentally investigates electrokinetic transport in heterogeneous porous media and optimizes the delivery method.
JOURNAL OF CONTAMINANT HYDROLOGY
(2022)
Article
Water Resources
Riccardo Sprocati, Andrea Gallo, Marie Boeskov Caspersen, Massimo Rolle
Summary: Electrokinetic (EK) techniques show great potential for in situ subsurface remediation of organic and inorganic contaminants in porous media. However, the mechanisms governing EK applications in porous media are complex and involve various processes. This study investigates the interactions between density driven effects and electrokinetic transport in permeable porous media.
ADVANCES IN WATER RESOURCES
(2023)
Article
Environmental Sciences
Henning Wienkenjohann, Biao Jin, Massimo Rolle
Summary: This study investigates the impact of diffusive-dispersive processes on isotope fractionation of organic contaminants in groundwater. Through experiments and simulations at different scales, the study demonstrates the significant influence of diffusive-dispersive processes on isotope signatures of chlorinated ethene plumes.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Riccardo Sprocati, Andrea Gallo, Henning Wienkenjohann, Massimo Rolle
Summary: This study investigates the effects of temperature on electrokinetic transport in porous media. The results show that an increase in temperature leads to a higher speed of amendments delivery and increased kinetics of degradation reactions. The simulations also reveal a feedback mechanism where higher aqueous conductivity results in increased Joule heating, leading to a faster temperature rise and higher electrolyte conductivity.
JOURNAL OF CONTAMINANT HYDROLOGY
(2023)
Article
Environmental Sciences
Monica Basilio Hazas, Francesca Ziliotto, Jonghyun Lee, Massimo Rolle, Gabriele Chiogna
Summary: This study investigates the effects of fluctuating surface water bodies on solute transport in aquifers. The results show that highly transient boundary conditions lead to a larger area, perimeter, and dilution of solute plumes. The study also identifies different regimes of dilution and reaction domination, characterized by increasing and decreasing plume entropies at different mixing ratios. Furthermore, reactive mixing is enhanced by transient flows, resulting in faster degradation of contaminant plumes compared to steady flow conditions.
JOURNAL OF CONTAMINANT HYDROLOGY
(2023)
Article
Engineering, Environmental
Muhammad Muniruzzaman, Massimo Rolle
Summary: This study assesses the impact and relevance of microscale electrostatic effects on macroscopic contaminant transport in heterogeneous groundwater systems involving clay zones. The results show that electrostatic mechanisms within clay's diffuse layer can significantly affect contaminant migration, leading to different mass loading/release behaviors. It also emphasizes the significance of considering electrostatic processes in subsurface hydrology to accurately predict contaminant migration.
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2023)
Article
Physics, Fluids & Plasmas
Monica Basilio Hazas, Francesca Ziliotto, Massimo Rolle, Gabriele Chiogna
Summary: This study provides experimental evidence of the relationship between mixing and flow field topology in porous media. The model-based interpretation shows that changes in boundary conditions can affect mixing dynamics and Shannon entropy of tracer distribution. Despite variations in hydrodynamic dispersion coefficients, the mixing dynamics remain stable due to control by the Okubo-Weiss parameter.