Article
Water Resources
Lynn Schreyer, Zachary Hilliard
Summary: This study uses generalizations of the Cahn-Hilliard equation to model two-phase flow in porous media, developing a framework that recovers the Korteweg stress tensor for the liquid phase, generalizes Darcy's law, and recovers the classical Cahn-Hilliard equation at the macroscale. Results for three phases are derived as a generalization of Richards equation, and simplifying assumptions allow for recovery of two-phase results, producing a pore scale model for two liquid phases. The formulation captures different energies of three interfaces without introducing corresponding quantities at the microscale.
ADVANCES IN WATER RESOURCES
(2021)
Article
Mathematics, Applied
Lynn Schreyer, Nikos Voulgarakis, Zachary Hilliard, Sergey Lapin, Loren Cobb
Summary: Recent advances in continuum mechanics methods have provided unexpected benefits for modeling refugee movements in complex humanitarian emergencies. A single deterministic partial differential equation, a generalization of the Cahn-Hilliard equation, has been developed and numerically solved to demonstrate plausible refugee movements under various conditions.
SIAM JOURNAL ON APPLIED MATHEMATICS
(2021)
Article
Mathematics, Applied
Hyun Geun Lee, Junxiang Yang, Sangkwon Kim, Junseok Kim
Summary: This paper presents a mathematical model and numerical scheme for droplet evaporation, using a Cahn-Hilliard equation with an interfacial evaporation mass flux term. The study shows that the dynamics of evaporation are influenced by the contact angle on a solid substrate.
APPLIED MATHEMATICS AND COMPUTATION
(2021)
Article
Mechanics
Graham P. Benham, Mike J. Bickle, Jerome A. Neufeld
Summary: This study focuses on upscaling the effect of heterogeneities in porous media, specifically in relation to multiphase flow and the transition between viscous and capillary flow regimes. By modifying the classic Buckley-Leverett problem, the study demonstrates how and where the flow transitions between these regimes and its impact on flooding speeds. The implications of these results in the context of carbon dioxide sequestration are also discussed and compared with field data.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Stein K. F. Stoter, Tom B. van Sluijs, Tristan H. B. Demont, E. Harald van Brummelen, Clemens V. Verhoosel
Summary: This article introduces an immersed isogeometric analysis framework for modeling binary-fluid flows with geometrically complex boundaries. The framework utilizes efficient higher-order methods, special boundary conditions, and penalty techniques to accurately simulate fluid flow phenomena in complex geometries.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Ajinkya Kulkarni, Estefania Vidal-Henriquez, David Zwicker
Summary: In this paper, an efficient method is proposed to control the spatiotemporal organization of biomolecules in cells. By focusing on key degrees of freedom such as droplet positions and sizes, dynamical equations are derived using approximate analytical solutions and linearized equations. The method is verified against fully-resolved simulations and shown to have lower computational costs compared to traditional methods for describing interacting droplets. It can be extended to include other processes, making it a relevant platform for understanding droplet dynamics in cells.
SCIENTIFIC REPORTS
(2023)
Article
Mechanics
Wenhai Lei, Xukang Lu, Fanli Liu, Moran Wang
Summary: This study reports the non-monotonic wettability effects on displacement efficiency in porous structures. Experiments show that there exists a critical wettability in porous matrix structures with preferential flow pathways to achieve the highest displacement efficiency. The distribution of phases in porous structures also varies under different wettability conditions. Pore-scale mechanisms are identified to explain the formation of this non-monotonic wettability rule.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Graham P. Benham, Mike J. Bickle, Jerome A. Neufeld
Summary: The study examines the effects of horizontally layered heterogeneities on the spreading of two-phase gravity currents in a porous medium and finds that heterogeneities can significantly increase plume migration speed and that uncertainty in field measurements can have a major impact on flow predictions.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mathematics, Applied
Daozhi Han, Xiaoming He, Quan Wang, Yanyun Wu
Summary: The study presents a diffuse interface model for two-phase flows in superposed free flow and porous media, with global existence of weak solutions in three dimensions established. The strong solution, if it exists, is shown to be consistent with the weak solutions.
NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS
(2021)
Article
Computer Science, Interdisciplinary Applications
Armin Shahmardi, Marco Edoardo Rosti, Outi Tammisola, Luca Brandt
Summary: A fully Eulerian hybrid immersed-boundary/phase-field model is proposed for simulating wetting and contact line motion over any arbitrary geometry. The algorithm is capable of accurately handling three-phase contact line motion over complex walls, as demonstrated through validation tests and simulations. Its Eulerian feature facilitates implementation and provides straightforward parallelization, making it highly scalable.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Dayong Li, Juan Gu, Yong Li, Ziqun Zhang, Yutong Ji
Summary: In this study, trapped and surface nanobubbles were observed and manipulated using an atomic force microscope. The results showed that both types of nanobubbles have the same chemical nature and provided important experimental evidence for nanobubble stability and industrial applications.
Article
Mathematics, Applied
Bo You
Summary: The paper considers the long-time behavior of solutions for the Cahn-Hilliard-Navier-Stokes system with moving contact lines, proving the existence of a trajectory attractor and constructing trajectory statistical solutions based on abstract results.
DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS-SERIES B
(2021)
Article
Engineering, Environmental
Shahab Karimifard, Xu Li, Christian Elowsky, Yusong Li
Summary: The study demonstrates that the overall permeability of porous media, flow pathways, and overall/local pressure gradients are highly dependent on biofilm ratio and biofilm permeability when biofilm levels are high and intermediate. However, the impact of biofilm porosity is moderate in these cases. Simplified biofilm geometries can provide reasonable approximations of permeability when biofilm structures are well developed.
Article
Mathematics, Applied
Nitu Lakhmara, Hari Shankar Mahato
Summary: This article discusses a phase-field model for two-phase immiscible, incompressible porous media flow with surface tension effects. The homogenized equations for the microscopic model are obtained using the unfolding operator and two-scale convergence approach.
NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS
(2022)
Article
Engineering, Multidisciplinary
Tianyi Hu, Yu Leng, Hector Gomez
Summary: This paper proposes a new method to impose boundary conditions naturally in the weak form of higher-order PDEs. By weighting the boundary conditions and using multiple integrations by parts, accurate and efficient imposition of boundary conditions on complex geometries is achieved.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Polymer Science
Hossein Chamkouri, Majid Ahmadlouydarab, Hafez Talebi, Hafiz Muhammad Ali
Summary: The researchers prepared a three-dimensional hybrid polymer structure with excellent electromagnetic absorption properties, which were successfully characterized through XRD, FTIR, and FE-SEM tests. These structures were embedded into paraffin as a matrix, beneficial for microwave energy attenuation, and showed promising prospects for electromagnetic absorption with low cost.
Article
Computer Science, Interdisciplinary Applications
Lida Alinezhad, Farzan Ghalichi, Majid Ahmadlouydarab, Maryam Chenaghlou
Summary: The study focused on examining the blood flow inside the left atrial appendage (LAA) and its removal effects in two patients with different morphologies. The results showed that velocity and vorticity decreased under atrial fibrillation (AF) conditions inside the left atrium for both patients. However, the removal of LAA may have unpredictable consequences due to varying LAA shape and volume.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2022)
Article
Engineering, Chemical
Hossein Chamkouri, Majid Ahmadlouydarab, Mahyodin Chamkouri, Fatemeh Hosseini Saeidavi
Summary: This study reports an innovative system that utilizes microcapsules embedded in epoxy resin to create a self-healing structure, addressing the issue of structural damage caused by environmental factors such as climate change, temperature fluctuations, and mechanical forces. The microcapsules were shown to have rough surfaces that improve mechanical bonding, and they exhibit good chemical structure and thermal stability.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Green & Sustainable Science & Technology
Majid Ahmadlouydarab, Tahereh Dana Anari, Alireza Akbarzadeh
Summary: This research investigates the efficiency of energy absorption in a cylindrical solar collector and two flat plate solar collectors. The results show that increasing the concentration of nanofluid enhances the heat absorption efficiency of the collectors, and the flat plate solar collector with a smaller exposed surface area has the highest absorption efficiency. Additionally, experiments with shorter heat absorption time yield higher energy absorption efficiency.
Article
Engineering, Chemical
Samine Rostami, Majid Ahmadlouydarab, Amin Sharifi Haddad
Summary: This experimental study investigated the recovery of a viscous fluid from a porous medium by injecting different fluids. The results showed that reducing the injection flowrate and increasing the injection temperature contributed to higher base oil recovery. The addition of surfactants and nanoparticles reduced interfacial tension and altered the wettability of the porous medium, leading to improved recovery efficiency.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Biophysics
Z. Wang, R. Lu, W. Wang, F. B. Tian, J. J. Feng, Y. Sui
Summary: We propose a three-dimensional computational model to simulate the transient deformation of suspended cancer cells flowing through a constricted microchannel. The cell is modeled as a liquid droplet enclosed by a viscoelastic membrane, with its nucleus as a smaller stiffer capsule. The results show that a viscoelastic cell membrane model with the membrane viscosity depending on its mode of deformation can achieve excellent agreement with experimental results on human leukemia cells.
BIOMECHANICS AND MODELING IN MECHANOBIOLOGY
(2023)
Article
Engineering, Chemical
Naser Asadzadeh, Majid Ahmadlouydarab, Amin Sharifi Haddad
Summary: Recent research suggests that injecting nanofluid solutions into oil reservoirs can enhance oil recovery, but there is limited understanding of important parameters such as antigravity fluid injection. This study investigated the effects of temperature and antigravity injection on oil recovery enhancement, as well as the impact of wettability alteration, interfacial tension, and viscosity. The results showed that decreasing the capillary number during antigravity fluid injection significantly improved oil recovery, and using nanofluids instead of water led to substantial increases in recovery through interfacial tension reduction. Additionally, increasing the injection temperature reduced interfacial tension, further enhancing oil recovery.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Developmental Biology
Dina J. Ashour, Clinton H. Durney, Vicente J. Planelles-Herrero, Tim J. Stevens, James J. Feng, Katja Roper
Summary: During embryogenesis, the coordination of large-scale changes in tissue primordia is important for development. In Drosophila, supracellular actomyosin cables, composed of the protein Zasp52, are involved in this coordination, particularly in regions such as the ventral midline and the boundary of the salivary gland placode. Zasp52 interacts with junctional components and actomyosin regulators, and its absence leads to severe embryonic defects. These findings suggest that Zasp52-containing cables aid in insulating morphogenetic changes from one another during embryogenesis.
Article
Thermodynamics
Mahdiyeh Ahmadi, Majid Ahmadlouydarab, Mohammadali Maysami
Summary: The experimental study investigates the effects of different nanofluids and heat-light sources on the thermal energy absorption of a laboratory-scale flat plate solar collector (FPSC). Water-based nanofluids containing Al2O3, SiO2, and TiO2 nanoparticles at a concentration of 0.2% were used as the service fluid. Tungsten heat lamp demonstrated the highest thermal efficiency among the different heat-light sources considered.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Physics, Multidisciplinary
Masih Darbandi, Zahra Valizadeh Ziaee, Majid Ahmadlouydarab
Summary: A solar collector is a device that collects and converts solar energy into thermal energy. In this study, TiO2 nanoparticles with controlled size and facet orientation were prepared and their effects on the performance of the solar collector were investigated. The results showed that the combination of size and facet orientation had a positive synergy effect on the absorption efficiency of the solar collector.
Article
Multidisciplinary Sciences
Zelai Xu, Pengtao Yue, James J. Feng
Summary: Albuminuria occurs when albumin leaks into the urine, and the mechanism behind it is not well understood. A gel-compression hypothesis suggests that compression of the glomerular basement membrane (GBM) acts as a barrier, but it fails to explain the reduction in filtration flux and thickening of the GBM. A second mechanism involving constriction of flow area at the slit diaphragm must also be considered. By combining these two mechanisms, the poroelastic model validates the hypothesis and explains the in vivo features of albuminuria.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2023)
Proceedings Paper
Computer Science, Interdisciplinary Applications
Alzbeta Bohinikova, Iveta Jancigova, Ivan Cimrak, James J. Feng
Summary: This work presents a computational model of elastic double cluster and focuses on the adhesion between the two cells. The model is validated through experimental and computational simulations, and can be used as a building block in future computational studies.
BIOINFORMATICS AND BIOMEDICAL ENGINEERING, PT II
(2022)
Article
Biochemical Research Methods
James J. Feng, Sarah Hedtrich
Summary: Organ-on-chip devices (OoCs) provide a more detailed understanding of (patho)physiological processes than traditional tissue models. However, the current design approach lacks systematic scaling, limiting the predictive value. The proposed similarity scaling approach can significantly improve the design and operation of OoCs.
Article
Physics, Fluids & Plasmas
J-C Loudet, A. Choudhury, M. Qiu, J. J. Feng
Summary: We present numerical simulations of a particle trapped at the isotropic-nematic liquid crystal interface. The results show that the response of the system is driven by the existence of an anchoring conflict at the contact line. Drag forces exerted on the particle moving along the interface are also computed.
Article
Multidisciplinary Sciences
Majid Ahmadlouydarab, Karim Ghaffari, Arezou Jafari
Summary: The study highlights the significance of phase change, particularly steam condensation, in enhanced oil recovery (EOR) processes. It suggests that the combination of nanoparticles and hot fluids can enhance EOR efficiency. Furthermore, fluid-fluid interfacial morphology at different temperatures plays a role in oil recovery.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Mechanics
Nicolas Bouvet, Savannah S. Wessies, Eric D. Link, Stephen A. Fink
Summary: This study presents a framework to characterize firebrand flows and compare exposure through the use of a measurement device and data processing methods. The ability to perform exposure comparisons and recognize combustion states is demonstrated.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
P. Botticini, G. Lavalle, D. Picchi, P. Poesio
Summary: This study investigates the gravity-driven liquid layer problem on an inclined plate, taking into account the variable density of the fluid. The study examines the influence of density variation on the formulation of a depth-averaged model and the role of compressibility in long-wave interfacial instability.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Jean-Paul Caltagirone
Summary: This article introduces a method for modeling capillary flows on a surface or at the interface of two fluids. The method involves handling the two components of capillary acceleration using the divergence and curl of surface normal. The proposed formulation is characterized by directional curvature based on dihedral angle, intrinsic anisotropic surface tension per unit mass, and introduction of capillary potential.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Qi-Teng Zheng, Chun-Bai-Xue Yang, Shi-Jin Feng, Yu-Chen Song, Yong Zhao, Yu-Lin Wu
Summary: This paper proposes a new two-phase partitioning boundary model to accurately predict the drying process of a porous medium from saturated to unsaturated conditions. The model is validated through laboratory soil drying tests and the study also investigates the effects of air-water interfacial area and water retention parameters on the drying process.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Svend Tollak Munkejord
Summary: Flashing flow is commonly found in industrial systems and accurate flashing models are essential for the design of safe and efficient CO2 transportation systems. We propose a homogeneous flashing model that takes into account the physical phenomena of phase change. The model is fitted using CO2 pipe depressurization data and we find that the same model parameters can be applied for different cases.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Q. Tan, S. A. Hosseini, A. Seidel-Morgenstern, D. Thevenin, H. Lorenz
Summary: The possible impact of temperature differences during crystal growth is investigated in this study. A numerical model is developed to simulate the crystallization dynamics of (S)-mandelic acid, taking into account temperature effects. The study shows that the heat generation at the crystal interface has only a small effect on the surrounding temperature field.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hideki Murakawa, Sana Maeda, Sven Eckert
Summary: This study investigates the behavior of bubbles in a liquid metal under the influence of a magnetic field, particularly bubble chains. The results show that increasing the magnetic field strength suppresses the oscillations of the bubbles and concentrates their crossing positions in a specific area. Applying these findings to numerical models can further optimize continuous casting processes.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Johanna Potyka, Kathrin Schulte
Summary: This paper presents an advanced Volume of Fluid (VOF) method for performing three-dimensional Direct Numerical Simulations (DNS) of the interaction of two immiscible fluids in a gaseous environment with large topology changes. The method includes efficient reconstruction of phase boundaries near the triple line using a Piecewise Linear Interface Calculation (PLIC) method and enhanced surface force modeling with the Continuous Surface Stress (CSS) model. Implementation of these methods in the multi-phase flow solver Free Surface 3D (FS3D) yielded successful validation. The simulations provide valuable insights into the collision process and can support future modeling of immiscible liquid interaction.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Martin Rohde, Sebastian Burgmann, Uwe Janoske
Summary: This study investigates the effect of superimposing an incident flow and two-dimensional vibration on the critical air flow velocity required for the detachment of a droplet. The results show that oscillatory excitation at specific frequencies can significantly reduce the critical velocity for droplet detachment.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Tea-Woo Kim, Baehyun Min
Summary: Liquid-gas two-phase slug flow is a complex flow pattern in energy systems, and accurately predicting slug liquid holdup is crucial for system design and operation. Existing HLLS models have limited applicability due to a lack of physical basis. This study proposes a new dimensionless number SP and correlates it with HLLS data, resulting in a unified HLLS correlation that agrees closely with experimental data.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Christian Lieber, Stephan Autenrieth, Kai-Yannic Schoenewolf, Amy Lebanoff, Rainer Koch, Sterling Smith, Paul Schlinger, Hans-Joerg Bauer
Summary: The observation of acoustically levitated droplets offers great potential for studying their evaporation characteristics. The main objective of this study is to present an experimental setup that minimizes the disturbing effects of the levitation technique in order to investigate convective heat and mass transfer during droplet evaporation.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Facundo Cabrera-Booman, Nicolas Plihon, Mickael Bourgoin
Summary: The settling behavior of individual spheres in a quiescent fluid was experimentally studied. The mean trajectory angle with the vertical showed complex behavior as the parameters Gamma and Ga varied. The transition from planar to non-planar trajectories and the emergence of semi-helical trajectories were observed, especially for denser spheres.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hongbin Wang, Hanwen Luo, Jinbiao Xiong
Summary: This article introduces an iterative screening method for closure models in nucleate boiling flow simulation, and demonstrates its accuracy through experiments.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Han Deng, Anders Austegard, Armin Hafner, Svend Tollak Munkejord
Summary: This study investigates the rapid depressurization of liquid CO2 and compares the predictions of different models. It is found that higher temperatures result in shorter relaxation times.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Rizwan Zahoor, Sasa Bajt, Bozidar Sarler
Summary: This numerical study evaluates the jet characteristics of non-Newtonian power-law fluids in a gas dynamic virtual nozzle. The results show that shear-thinning fluids result in thicker, longer, and slower jets compared to shear-thickening fluids. Additionally, a dripping-jetting phase diagram of the nozzle is obtained by varying the power law index, gas, and liquid flow rates.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)