Article
Multidisciplinary Sciences
Patrick Kurzeja, Holger Steeb
Summary: The study investigated the acoustic properties of gas bubbles in porous media through a continuum description, extending the compressibility of bubbles in traditional models by considering surface tension and higher-order curvature effects. The framework allows for predicting the relationship between specific bubble sizes and acoustic properties, and whether respective signals can be detected with current instruments.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Computer Science, Interdisciplinary Applications
Ya Gao, Wenyi Xu, Yiming Chen, Weiya Xie, Qian Cheng
Summary: In this study, a convolutional neural network based on U-Net was developed to extract effective photoacoustic information from speckle patterns obtained under porous media, enabling the reconstruction of high-quality vessel images. The proposed deep learning-based algorithm outperforms traditional reconstruction methods.
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2022)
Article
Acoustics
A. Lebedev
Summary: This paper considers a method for remote studies of structurally inhomogeneous media, specifically focusing on the study of filtration noise. It provides a brief description of a previously proposed model for the occurrence of filtration noise, and compares calculation results with experimental data to demonstrate satisfactory agreement between the proposed theoretical model and measurement results. This research opens up possibilities for determining the parameters of porous media and fluid velocity through measuring filtration noise.
ACOUSTICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Apichit Maneengam, Tarek Bouzennada, Aissa Abderrahmane, Kaouther Ghachem, Lioua Kolsi, Obai Younis, Kamel Guedri, Wajaree Weera
Summary: A numerical study was conducted to analyze the effects of several factors on heat transfer, flow behavior, and entropy generation in a hybrid nanofluid within a rotating inner tube. The results indicate that increasing the nanoparticle volume fraction, Darcy number, and velocity of the inner tube enhances heat transfer. Additionally, these factors have a significant influence on entropy generation.
Article
Energy & Fuels
Mariola M. Blaszczyk, Lukasz Przybysz
Summary: Emulsion formation is an energy-consuming process, and alternative methods are needed to obtain emulsions with small droplet sizes. The use of imbibition process in porous materials allows for the creation of emulsions with small droplet sizes and reduced polydispersity.
Article
Geochemistry & Geophysics
Pinbo Ding, Jianxin Wei, Bangrang Di, Xiang-Yang Li, Lianbo Zeng
Summary: The study investigates the effects of fracture scale on wave responses and anisotropy in rocks, demonstrating significant impacts on velocity and anisotropy in rocks with different fracture sizes. Effective medium theories are adopted to analyze the anisotropy affected by fluid flow and fracture size, suggesting that scale effects of fractures should be considered in various disciplines for improved accuracy in investigations.
GEOPHYSICAL PROSPECTING
(2021)
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
Mechanics
Ai-jun Li, Yong Liu, Hui Fang
Summary: This paper studies the wave scattering problem of multiple dual porous circular cylinders in front of a vertical wall. An analytical solution to the hydrodynamic problem is developed in the context of potential flow theory, and the effect of the perforated shell on wave motion is considered. The wave force, wave run-up, and surface elevation near the cylinders are calculated, and the results are consistent with published results in several limiting cases. Feasible applications of dual porous cylinders are discussed, and valuable results are presented by visualizing the wave amplitude distribution near the structures.
Article
Multidisciplinary Sciences
M. J. Bereyhi, A. Beccari, R. Groth, S. A. Fedorov, A. Arabmoheghi, T. J. Kippenberg, N. J. Engelsen
Summary: Structural hierarchy plays a significant role in biological systems and man-made structures, improving energy dissipation and opening new possibilities in force sensing, signal transduction, and quantum optomechanics.
NATURE COMMUNICATIONS
(2022)
Article
Thermodynamics
Oktay Cicek, A. Filiz Baytas, A. Cihat Baytas
Summary: This study investigates the entropy generation minimization and mixed convective heat transfer of multi-walled carbon nanotubes-Fe3O4/water hybrid nanofluid flow in a lid-driven square enclosure with heat generation and a porous layer on inner surfaces. The study considers the local thermal non-equilibrium approach and the non-Darcy flow model. The results show that the direction of forced and free convection flow has a significant effect on entropy generation and average Nusselt numbers.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Mechanics
Si Suo, Yixiang Gan
Summary: In this study, a possible adjustment in pore geometry was reported to suppress capillary fingering and transition displacement patterns from fingering to compact mode in porous media with hierarchical structures. The results demonstrate that a higher porosity of the second-order porous structure can maintain compact displacement across a wider range of wettability conditions. This work provides insights into fluid-fluid displacement control in hierarchical porous media and can benefit the design of microfluidic devices for better fluid displacement efficiency at the field scale.
Article
Mechanics
M. Vynnycky, S. L. Mitchell
Summary: In this paper, the steady-state base flow for natural convection in a vertical porous slab with permeable boundaries is investigated. It is argued that the flow should be two-dimensional instead of one-dimensional, which was proposed in recent work, due to an oversight in the use of the Oberbeck-Boussinesq approximation. Two-dimensional numerical solutions for this flow are obtained using a pressure-temperature formulation, and the results are validated by asymptotic analysis. The paper also briefly discusses the relevance of these findings to other recent work on the stability of convection in porous slabs with permeable boundaries.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Dario Magliacano, Giuseppe Catapane, Giuseppe Petrone, Kevin Verdiere, Olivier Robin
Summary: The aim of this study is to investigate the effect of embedding periodic patterns in porous materials to passively enhance their acoustic performance. The focus is on improving sound transmission loss in classical aeronautical soundproofing packages. Numerical models of acoustic packages with periodic patterns were implemented using the finite element method and the Transfer Matrix Method. Experimental testing of some proposed configurations was conducted for comparison and validation of numerical results. Various configurations of inclusions were numerically studied, including hollow cylindrical inclusions, half-cut hollow cylindrical inclusions, and cylindrical Helmholtz resonators, to evaluate the improvements in transmission loss under plane wave excitation with different incidence angles. The main contributions of this work include experimental validation of proposed acoustic meta-materials previously only studied numerically, and consideration of the effect of including a periodic pattern of Helmholtz resonators in the foam core. Numerical results were also evaluated for different incidence angles of an exciting acoustic plane wave.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
K. S. Bharath, M. R. Flynn
Summary: The experiment investigates the outflow that occurs when a dense fluid plume hits a sloping permeability jump in a two-layered porous medium, with a focus on the dynamics in the intermediate thickness case. Primary gravity currents are arrested when the volume supplied by the plume matches that lost by basal draining, leading to the formation of secondary gravity currents. As the secondary gravity currents propagate left and right, they remobilize the primary gravity currents before being impeded by the sidewall boundaries and leading to layer filling.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Acoustics
Jean Boulvert, Thomas Humbert, Vicente Romero-Garcia, Gwenael Gabard, Edith Roland Fotsing, Annie Ross, Jacky Mardjono, Jean-Philippe Groby
Summary: This article explores the use of asymmetric absorbers made of detuned and folded quarter wavelength resonators to achieve superior sound absorption performance, as demonstrated through experimental testing.
JOURNAL OF SOUND AND VIBRATION
(2022)
