Article
Chemistry, Physical
Dian Fan, Emily Chapman, Aisha Khan, Francesco Iacoviello, Gediminas Mikutis, Ronny Pini, Alberto Striolo
Summary: In this study, the transport behavior of suspended colloids in heterogeneous porous media is investigated through core-flooding experiments and computational simulations. It is found that the observed anomalous transport is particle-type dependent and arises from the microscopic dispersion and deposition of particles in heterogeneous flow fields. The study also presents a residence-time distribution function that captures the entire transition from pre-asymptotic to asymptotic behavior, providing valuable insights for interpreting experimental data and designing colloidal tracers.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Bart Coppens, Tom E. R. Belpaire, Jiri Pesek, Hans P. Steenackers, Herman Ramon, Bart Smeets
Summary: Biofilms containing extracellular polymeric substances (EPS) can limit the penetration of antimicrobial treatment. To address this issue, functionalized nanoparticles (NPs) have been proposed as carriers for antimicrobial delivery. By using microscopy and modeling, we found that the structure of Salmonella biofilms affects the diffusion and distribution of NPs, with spatial gradients in diffusivity trapping NPs near bacteria. This study suggests that both biofilm structure and EPS level can impact the effectiveness of NP drug delivery, where low EPS levels may enhance delivery and high EPS levels may hinder it.
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
Environmental Sciences
Maosheng Yin, Rui Ma, Yong Zhang, Kewei Chen, Zhilin Guo, Chunmiao Zheng
Summary: Natural aquifers with multiscale heterogeneity and complex flow networks pose challenges for the reliable simulation and prediction of contaminant transport. To address this issue, a dual heterogeneous domain model (DHDM) was proposed to quantify solute transport. The DHDM can accurately capture multiple peaks and transient tailing behaviors in solute breakthrough curves (BTCs), and it has been validated in different aquifer settings.
WATER RESOURCES RESEARCH
(2022)
Article
Energy & Fuels
Jonathan Garcez, Miao Zhang, Luis F. Ayala
Summary: The exploitation of unconventional reservoirs is made possible through the use of multi-fractured horizontal wells. This paper proposes a model based on anomalous transport concept to simulate gas flow in highly heterogeneous unconventional reservoirs. The study shows that higher heterogeneity levels require greater pressure drawdown to maintain a constant flow rate, indicating the need to properly account for the nonlinear behavior of gas properties.
Article
Physics, Multidisciplinary
M. K. Lenzi, E. K. Lenzi, L. M. S. Guilherme, L. R. Evangelista, H. V. Ribeiro
Summary: In this study, we investigated a diffusion process in heterogeneous media with stochastic resetting to initial positions at a constant rate. Exact solutions for the probability distribution and mean square displacement of particles' positions were obtained using the Green function approach, which were compared with numerical simulations. The system exhibited non-Gaussian distributions, transient anomalous diffusion, and stationary states depending on media heterogeneity and resetting rate, with media heterogeneity affecting the mean first-passage time and yielding an optimal resetting rate with a minimum value for this quantity.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
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
Geosciences, Multidisciplinary
Yaniv Edery, Martin Stolar, Giovanni Porta, Alberto Guadagnini
Summary: The study reveals that dissolution and precipitation occur in different locations within the system, with preferential flow paths associated with high conductivity values contributing to a sustained feedback between transport and reaction processes. This leads to the emergence of non-Fickian effective transport features over time.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2021)
Article
Chemistry, Multidisciplinary
Yang Liu, Xu Zheng, Dongshi Guan, Xikai Jiang, Guoqing Hu
Summary: In this study, the impact of heterogeneous nanostructures on anomalous diffusion in dipalmitoylphosphatidylcholine (DPPC) monolayers is investigated. The existence of condensed nanodomains and their influence on diffusion are identified. The findings reveal a universal characteristic of multistage mean square displacement (MSD) and an anomalous double-peaked displacement probability distribution (DPD) phenomenon.
Article
Mechanics
Chunwei Zhang, Kazuki Kaito, Yingxue Hu, Anindityo Patmonoaji, Shintaro Matsushita, Tetsuya Suekane
Summary: Solute transport in porous media is sensitive to heterogeneity at all scales, with pore-scale behavior affecting larger scales. Using a lattice Boltzmann method, simulations show that more heterogeneous media exhibit larger dispersion coefficients, with distinctive time regimes and power-law scaling observed for different types of rocks. The significance of mass transfer rate on mechanical dispersion is evaluated using the Damhohler number.
Article
Mathematics, Applied
N. S. Arkashov, V. A. Seleznev
Summary: This study focuses on the investigation of heterogeneous diffusion processes defined as solutions to the overdamped Langevin equation with multiplicative noise, which has a power-law space-dependent form. The discrete analogs of these processes are specifically studied, and an asymptotic estimate of their variance behavior over time is obtained. Additionally, a class of processes formed by deforming the discrete analog of fractional Brownian motion using the Cantor ladder and its inverse transformation is considered, revealing a close structural similarity to discrete analogs of heterogeneous processes. Based on the discrete analogs of heterogeneous processes and memory flow phenomenology, a class of random processes is constructed to model nonlocality in time and space, accounting for spatial heterogeneity.
Article
Environmental Sciences
Yufeng Sun, Zhen Zhang, Jiaxi Heng, Chao Gao, Qiang Jin, Zongyuan Chen, Zhijun Guo
Summary: This study investigates the influence of colloidal biochar on U(VI) transport in the environment. The results show that the transport of U(VI) is pH-dependent and insensitive to ionic strength, while the transport of biochar colloids is more sensitive to changes in ionic strength. In the presence of biochar, the transport of U(VI) is significantly facilitated due to U(VI) adsorption. However, at high ionic strength, the transport of biochar is impeded. Colloid size exclusion effect and kinetic attachment/detachment model are observed in the transport of biochar. This work emphasizes the importance of considering the risk assessment of biochar-facilitated heavy metal transport in the remediation of contaminated sites.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Silvia De Simone, Olivier Bour, Philippe Davy
Summary: Heat transport in fractured aquifers is influenced by the heterogeneity of flow velocity in the fracture system as well as the diffusive exchange between fluid and rock matrix. This study focuses on the impact of diffusive exchange on heat transport response, compared to solute transport governed by pure advective displacement. The behavior observed after the peak differs from matrix diffusion and is driven by the variability of velocity field and fracture aperture field. Theoretical models are derived to predict these pre-asymptotic tails under extreme cases related to specific network structures.
WATER RESOURCES RESEARCH
(2023)
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
Geochemistry & Geophysics
Bohyun Hwang, Deepansh J. Srivastava, Hang Deng, Philip J. Grandinetti, David R. Cole
Summary: Sodium can be used as a tracer for brine in reservoir formations, and this study investigates the diffusion behavior of sodium in both bulk solution and porous media using nuclear magnetic resonance (NMR) techniques. The results show that the diffusion rate of sodium decreases with increasing counter-ion size, with a greater effect observed at higher ionic strengths and in porous media. By combining numerical simulation and experimental methods, effective diffusion coefficients and matrix properties can be estimated.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Physics, Multidisciplinary
Marco Heinen, Simon K. Schnyder, John F. Brady, Hartmut Loewen
PHYSICAL REVIEW LETTERS
(2015)
Article
Chemistry, Physical
Simon K. Schnyder, Markus Spanner, Felix Hoefling, Thomas Franosch, Juergen Horbach
Article
Chemistry, Physical
Alice L. Thorneywork, Simon K. Schnyder, Dirk G. A. L. Aarts, Juergen Horbach, Roland Roth, Roel P. A. Dullens
Article
Physics, Multidisciplinary
Simon K. Schnyder, Juergen Horbach
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Multidisciplinary
Thomas O. E. Skinner, Simon K. Schnyder, Dirk G. A. L. Aarts, Juergen Horbach, Roel P. A. Dullens
PHYSICAL REVIEW LETTERS
(2013)
Article
Multidisciplinary Sciences
Simon K. Schnyder, John J. Molina, Yuki Tanaka, Ryoichi Yamamoto
SCIENTIFIC REPORTS
(2017)
Article
Multidisciplinary Sciences
Simon K. Schnyder, John J. Molina, Ryoichi Yamamoto
SCIENTIFIC REPORTS
(2020)
Article
Physics, Multidisciplinary
Jintao Li, Simon K. Schnyder, Matthew S. Turner, Ryoichi Yamamoto
Summary: Cells coexist in colonies or tissues, their behavior is controlled by intercellular forces and biochemical regulation. Researchers develop a simple model of the cell cycle and couple it with physical forces within the cell collective, analyzing it through computer simulations and a continuum theory. The study focuses on 2D colonies confined in a channel, showing the relationship between substrate friction and cell-cycle parameters in measuring these parameters experimentally.
Article
Multidisciplinary Sciences
Simon S. Schnyder, John Molina, Ryoichi Yamamoto, Matthew Turner
Summary: During epidemics, people may decrease their social and economic activities to lower the risk of infection. The decision-making process for social distancing strategies depends on information about the epidemic course and the expected end, such as vaccination timing. Optimal decisions are challenging due to incomplete and uncertain information. In this study, we demonstrate how optimal decision-making is influenced by information about vaccination timing in a differential game that considers individual decision-making and a probability distribution for vaccine arrival. We predict that social distancing will be stronger when vaccination is expected earlier and when the probability distribution is more sharply peaked. Equilibrium social distancing significantly deviates from the no-vaccination equilibrium only if the vaccine is expected to arrive before the epidemic would naturally end. We show how the probability distribution of vaccination time acts as a generalized form of discounting, with exponential vaccination time distribution corresponding to regular exponential discounting.
Article
Physics, Multidisciplinary
Jintao Li, Simon K. Schnyder, Matthew S. Turner, Ryoichi Yamamoto
Summary: Competition between different cell types is crucial in bacterial ecology, developmental biology, and tumor growth. Synchronization in cell division/apoptosis events can lead to oscillations in pressure and cell-cycle activity. Additionally, the pressure at the colony interface can affect the coexistence and invasion of cell types.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
David G. Rees, Sheng-Shiuan Yeh, Ban-Chen Lee, Simon K. Schnyder, Francis I. B. Williams, Juhn-Jong Lin, Kimitoshi Kono
Article
Chemistry, Physical
Matteo Campo, Simon K. Schnyder, John J. Molina, Thomas Speck, Ryoichi Yamamoto
Article
Chemistry, Multidisciplinary
Ryoichi Yamamoto, John J. Molina, Simon K. Schnyder
JOURNAL OF COMPUTER CHEMISTRY-JAPAN
(2018)
Article
Physics, Fluids & Plasmas
Simon K. Schnyder, Thomas O. E. Skinner, Alice L. Thorneywork, Dirk G. A. L. Aarts, Juergen Horbach, Roel P. A. Dullens