Article
Environmental Sciences
Beibei Gao, Xiaopu Wang, Roseanne M. Ford
Summary: In this study, naphthalene and Pseudomonas putida G7 were used to investigate the potential role of chemotaxis in enhancing access to PAHs. The results showed that chemotactic bacteria accumulated more at the junctures between high and low permeability regions, where stagnant fluid flow generated strong and persistent naphthalene gradients. Macroscale simulations indicated that bacterial dispersion needed to be increased by 50% to account for the interplay between chemotactic response and naphthalene gradients at the pore-scale level. This study details the mechanism of pore-scale chemotaxis in enhancing bioavailability of PAHs and provides a potential solution for more efficient bioremediation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Thermodynamics
O. H. Hassan, G. Sultan, M. N. Sabry, A. A. Hegazi
Summary: This paper experimentally investigates heat transfer by forced convection in a cylindrical channel made of a porous medium. The results show that heat transfer can be significantly enhanced by decreasing the porosity of the channel and increasing the Reynolds number.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Johan O. A. Robertsson, Fredrik Andersson, Rene-Edouard Plessix
Summary: This article discusses how highly accurate reverse time migrated images and FWI model parameter gradients can be efficiently computed in anisotropic elastic FWI without significant disk I/O using the principle of superposition.
Article
Mechanics
Dat G. Phan, Giang D. Nguyen, Ha H. Bui
Summary: The study aims to develop a model for erosion mechanism considering the interaction and mass exchange between solid and fluid phases. The erosion processes are described through mass, momentum and energy balances based on Biot's mixture theory. The proposed work input leads to the derivation of effective stress tensor and coupled hydro-mechanical-erosion criteria, which provide a better understanding of particle erosion.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Mechanics
E. J. G. Arcondoulis, Y. Liu, D. Ragni, F. Avallone, A. Rubio-Carpio, N. Sedaghatizadeh, Y. Yang, Z. Li
Summary: Vortex shedding in the wake of a cylinder can be suppressed by applying a porous coating, but the mechanism is not fully understood. In this study, a 3D printed structured porous coated cylinder (SPCC) was used to analyze the flow fields and reveal the origins of vortex shedding. Through experiments, it was found that the vortex shedding originates from the inner diameter and propagates through the porous layers to the external flow field at a lower velocity.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Engineering, Marine
Yiyang Hu, Haisheng Zhao, Wei Shi, Chunwei Bi, Xin Li
Summary: A three-dimensional numerical model for the UHMWPE cage was established, revealing the flow field characteristics of both internal and external flows. The study found that the degree of deceleration decreases as the flow velocity increases, but this effect becomes less apparent when the flow velocity reaches a certain threshold. Furthermore, the study compared the flow field characteristics of double cages with different spacing and multiple cages with equal spacing.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Environmental
Yuqing Zhou, Danny J. Lohan, Feng Zhou, Tsuyoshi Nomura, Ercan M. Dede
Summary: In this paper, an inverse design and dehomogenization framework is proposed to discover innovative microreactor flow field designs. Through numerical simulations, trade-offs between reaction performance and fluid flow performance are found for multiple optimized microreactor flow fields. Applying the findings of this study to new reactor flow field designs can enhance performance in biomedical, pharmaceutical, and energy applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Geochemistry & Geophysics
Benjamin L. Hess, Jay J. Ague
Summary: Intracrystalline diffusion is a valuable tool for estimating geological timescales. Existing diffusion models, which are based on chemical potential gradients caused by composition variations, cannot simulate diffusion induced by stress gradients. To address this issue, we have derived a flux expression that allows for the modeling of diffusion in crystalline solids under arbitrary stress states by using gradients in a thermodynamic potential called relative chemical potential.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Engineering, Marine
Enjin Zhao, Youkou Dong, Yuezhao Tang, Xiaoyu Xia
Summary: This study systematically investigates the effects of semi-circular porous medium breakwaters on the breaking solitary wave run-up, finding that porous breakwater has a more significant impact on wave propagation compared to solid breakwater. With the increase of the gravel particle median diameter, the hydrodynamic forces on the breakwater decrease horizontally but increase vertically. Increasing the size of the breakwater is beneficial for reducing wave run-up height.
Article
Mathematics, Applied
Mohamad Jammoul, Mary F. Wheeler, Thomas Wick
Summary: This study focuses on the potential of phase-field methods to simulate large scale evolution of fractures in porous media. To perform practical field simulations, robust and efficient decoupling techniques are required. The research emphasizes on the mechanics-step involving the coupling of elasticity and phase-field variable, and demonstrates improved algorithm performance through a multirate scheme.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Thermodynamics
Mou Wang, Hui Wang, Ying Yin, Susanto Rahardja, Zhiguo Qu
Summary: In this study, a supervised convolutional neural network (CNN) was used to predict the temperature field and effective thermal conductivity of porous media under various boundary conditions. The CNN achieved accurate and fast predictions, showing promise for the prediction of heat transport properties in porous media.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Weaam Alhejaili, Abdelraheem M. Aly
Summary: This work conducts simulations of fractional-time derivative systems of natural convection in a porous annulus suspended by NEPCM under the magnetic field and thermal radiation influences using the ISPH method. The study focuses on the effects of a magnetic field on natural convection in a novel annulus shape between two horizontal wavy shapes. The results show that the time-fractional derivative has significant contributions at the initial time step, increasing nanoparticle concentration reduces the nanofluid flow, the heat capacity is affected by the thermal radiation parameter, and an extra Rayleigh number enhances temperature strength and nanofluid velocity within the annulus.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Mechanics
Duncan R. Hewitt
Summary: This study investigates the effect of a series of thin, horizontal, low-permeability layers on convective motion in a two-dimensional porous medium. High-resolution numerical simulations and simple analytical models are used to explore the role of the Omega parameter and reveal a transition from predominantly diffusive to predominantly advective transfer for intermediate Omega values.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Energy & Fuels
Yan-Xiao He, Xin-Long Li, Gen-Yang Tang, Chun-Hui Dong, Mo Chen, Shang-Xu Wang
Summary: This study presents an improved AVO modeling method that accurately considers the impacts of frequency-dependence and incident-angle variations on reflection responses. By utilizing a frequency-domain propagator matrix method, it provides a better understanding of reflective characteristics in fractured porous media and enhances seismic interpretation of reservoirs.
Article
Materials Science, Multidisciplinary
Ivan S. Oliveira, Alexandre M. Souza, Roberto S. Sarthour, Joao P. Sinnecker
Summary: This paper presents a numerical study of pulse NMR spectra and T-2 relaxation of fluids under realistic magnetic field gradients using the software COMSOL. The internal magnetic field gradient is calculated in the whole system, and then the NMR signal and T-2 relaxation of the liquids inside the system are obtained. Different magnetic properties, coupling parameters, pore sizes, and geometries are considered in the study.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
