Review
Physics, Multidisciplinary
Hassan Akhlaghi, Ehsan Roohi, Stefan Stefanov
Summary: The current paper provides a detailed review of important topics in micro-and nanoscale gas flows, including velocity slip and temperature jump phenomena, Knudsen minimum, and thermally-driven flows. The review summarizes the latest advancements and investigations on velocity slip and temperature jump, as well as the modeling of rarefied gas flows. It also discusses the Knudsen paradox, thermally-driven flows, and the application of Knudsen pumps. Overall, this review highlights the emerging physical science and engineering applications of micro-and nanoscale gas flows.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2023)
Article
Mechanics
Yanbiao Gan, Aiguo Xu, Huilin Lai, Wei Li, Guanglan Sun, Sauro Succi
Summary: This paper aims to formulate and validate a multi-scale discrete Boltzmann method based on density functional kinetic theory for thermal multiphase flow systems. It also provides new insights into the thermo-hydrodynamic non-equilibrium effects in the phase separation process.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Physics, Multidisciplinary
M. Davoodianidalik, H. Punzmann, H. Kellay, H. Xia, M. Shats, N. Francois
Summary: This study provides experimental evidence for the existence of fluctuation-induced forces mediated by turbulent fluctuations in confined turbulence. The strength of this long-range interaction is dependent on the wall separation and energy injection rate in the turbulent flow. The mechanism of force generation is rooted in the nontrivial fluid-wall coupling, where coherent flow structures are guided by the cavity walls.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mechanics
Xuechun Liu, Ruidi Bai, Shanjun Liu
Summary: The similarity and scale effects in the aeration process of flows in chute aerators were systematically investigated using physical models of three different geometric scales. The experimental results showed that the parameters of air concentration and bubble count rate were scale-sensitive, while the velocity and turbulence intensity were almost free of scale effects. The Reynolds number seemed to have a significant effect on bubble size which was observed to increase with increasing Reynolds number.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2023)
Article
Physics, Applied
Toshiyuki Kawasaki, Masahiro Kamasaki, Nozomi Takeuchi, Fumiaki Mitsugi
Summary: The initial surfactant concentration has a significant impact on the characteristics of plasma-induced liquid flows, with the intensity of the flows depending on the driving force influenced by both surfactant concentration and plasma-irradiation time. Changes in surface tension gradient resulting from plasma irradiation are closely related to the direction and intensity of the liquid flows.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Mechanics
Julian Restrepo, Jose R. Simoes-Moreira
Summary: This study investigates the viscous effects on an ideal gas flow in a supersonic convergent-divergent nozzle using a realistic equation of state. The study discusses the influence of the Gruneisen parameter, viscous and real gas effects on the formation of the sonic point, and calculates the maximum values of the discharge coefficient and the isentropic nozzle efficiency. Furthermore, the study evaluates the formation and intensity of normal shock waves using the Rankine-Hugoniot relations, which now depend on real gas and viscous effects.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Lianhua Zhu, Xingcai Pi, Wei Su, Zhi-Hui Li, Yonghao Zhang, Lei Wu
Summary: The general synthetic iterative scheme (GSIS) has been extended to find the steady-state solution of the nonlinear gas kinetic equation, addressing the issues of slow convergence and requirement of ultra-fine grids in near-continuum flows. The tight coupling of gas kinetic and macroscopic synthetic equations, along with the simplification in constructing higher-order constitutive relations, allows for faster convergence and reduced deviation in the solution. Additionally, the GSIS can be applied to a wide range of engineering applications due to its independence on the specific form of Boltzmann collision operator and compatibility with computational fluid dynamics techniques.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Energy & Fuels
Ke Wang, Beibei Jiang, Kairui Ye, Haitao Li, Yongsheng Tan
Summary: This study comprehensively analyzes the imbibition pressures of the gas-water phase and introduces a new imbibition model that performs better in predicting fluid loss during the hydraulic fracturing process for shale gas wells.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Debanjan Chandra, Vikram Vishal, Jitendra Bahadur, Ashish Kumar Agrawal, Avik Das, Bodhisatwa Hazra, Debasis Sen
Summary: This study investigates the shale fabric and estimates the pore volume distribution in shales of varying thermal maturity and organic carbon content. The results show that higher thermal maturity shales have a greater bulk accessible pore volume and smaller mesopores are less accessible compared to coarser pores. The uniformity of functional group and organic matter distribution in shale depends on maturity and reflects the variation in pore volume.
Article
Mechanics
Y. Mezui, M. Obligado, A. Cartellier
Summary: The hydrodynamics of bubble columns in the heterogeneous regime is studied experimentally. The void fraction field at small scales is analyzed and found to differ significantly from a random Poisson process in the heterogeneous regime. Meso-scale structures, such as clusters, void regions, and intermediate regions, are identified and found to drive the motion of bubbles. The relative velocity of bubbles is related to the concentration and characteristic size of these meso-scale structures, and a cartoon of the internal flow structure is proposed based on their values at large gas superficial velocities.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Thermodynamics
Xiaowei Wang, Wenqing Zhang, Tianyi Su, Zhijun Zhang, Shiwei Zhang
Summary: The research reveals the significant impact of NEAC and TMAC variations on flow fields, thermal fields, pressure, and Knudsen force, with a nonlinear relationship observed between Knudsen force and NEAC as well as TMAC. Decreasing accommodation coefficients lead to an increase in the slope of the curve for Knudsen force, highlighting the sensitivity of these parameters to rarefied gas flows.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Mechanics
S. Bodea, E. Beauvier, A. Pocheau
Summary: We experimentally studied the front propagation in a vortex lattice with closed steady cellular flows and no mean flow. By triggering an autocatalytic reaction in a solution stirred by magnetohydrodynamic flows, we observed a scale-invariant regime below a certain flow magnitude and a scale-dependent regime above it. The transition between these regimes corresponds to a Damköhler number of 1. The mean front velocity increases with the flow magnitude in the scale-invariant regime, but shows discrepancies in the scale-dependent regime.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Thermodynamics
Jorge Estrella, Davide Wuethrich, Hubert Chanson
Summary: The study presented a novel experimental investigation of air-water flow characteristics in hydraulic jumps with a small Froude number, and discussed potential scale effects involving different Reynolds numbers. It was found that many hydraulic jump properties could not be extrapolated from laboratory study to full scale hydraulic structures without substantial scale effects. These findings have significant implications for engineering design applications with high Reynolds numbers.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2022)
Article
Engineering, Chemical
Christian C. Milioli, Fernando E. Milioli
Summary: A new sub-grid drag model is proposed for fluidized gas-particle flows, which combines filtering over highly resolved simulations and microscopic two-fluid modeling to consider both micro-scale and macro-scale effects. By taking into account particle Froude numbers and ranges of average solid volume fractions and gas flow Reynolds numbers, the proposed model represents an improvement over previous versions.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Environmental Sciences
Ana L. Quaresma, Antonio N. Pinheiro
Summary: This study conducted 3D numerical modeling of flow in a pool-type fishway with bottom orifices using CFD software, and compared the results with experimental data, showing good agreement. The importance of numerical model validation for all parameters and analysis of scaling effects were highlighted in the study.
Article
Multidisciplinary Sciences
Tumcan Sen, Murat Barisik
SCIENTIFIC REPORTS
(2019)
Article
Chemistry, Physical
H. Gokberk Ozcelik, A. Cihan Ozdemir, Bohung Kim, Murat Barisik
MOLECULAR SIMULATION
(2020)
Article
Chemistry, Physical
H. Gokberk Ozcelik, Yigit Sozen, Hasan Sahin, Murat Barisik
APPLIED SURFACE SCIENCE
(2020)
Article
Chemistry, Physical
B. Oyku Alan, Murat Barisik, H. Gokberk Ozcelik
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Physical
Fetiye Esin Yakin, Murat Barisik, Tumcan Sen
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Multidisciplinary
Tumcan Sen, Murat Barisik
Article
Thermodynamics
Onur Yenigun, Murat Barisik
Summary: This study introduces a new method for controlling heat transfer between graphene and water using an applied non-uniform electric field, resulting in a substantial increase in heat transfer by reducing interfacial thermal resistance and increasing thermal conductivity. This technique helps distribute and concentrate heat between different regions, which is important for hot spot cooling and heat focusing applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
B. Oyku Alan, Murat Barisik
Summary: This study investigates the impact of temperature on the surface charge of silica nanoparticles (SNP) with different sizes and roughness, revealing a significant increase in surface charge with higher temperatures. The deviation from existing theory due to temperature variation is characterized, indicating a complex relationship between temperature, particle size, and surface charge regulation. A phenomenological model is proposed to predict surface charge of SNPs based on particle size, roughness, and temperature, offering important insights for nanoparticle characterization and potential applications involving temperature adjustments.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Thermodynamics
Safa Sabet, Murat Barisik, Bernardo Buonomo, Oronzio Manca
Summary: This study analyzed the effects of rarefaction on permeability and heat transfer coefficients in convective gas flows by conducting pore-level analysis of a Kelvin cell model. The results showed that rarefaction significantly enhanced permeability, but this enhancement decreased with increasing porosity. Rarefaction also weakened inertial effects and drag forces, with a more pronounced effect at high Reynolds numbers. For highly conductive metal foam structures, the influences of boundary slip and temperature jump canceled each other out, resulting in Nusselt numbers primarily being dependent on Reynolds number.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Onur Yenigun, Murat Barisik
Summary: In this study, an active heat transfer control between graphene and water was achieved using interdigitated electrodes. The nonuniform electric field created by oppositely charged co-planar electrodes enhanced the coupling between water and graphene and decreased the interfacial thermal resistance. The researchers found a linear relationship between the electric field strength and the Kapitza values, and the interdigitated electrode system required lower electrode charges. The results showed that the localized electric field at the interface can improve heat transfer efficiency, providing new possibilities for graphene-based materials in solving the thermal management problem in micro/nano-electronics.
Article
Materials Science, Composites
Gozde Esenoglu, Murat Barisik, Metin Tanoglu, Melisa Yeke, Ceren Turkdogan, Hande Iplikci, Seckin Martin, Kaan Nuhoglu, Engin Aktas, Serkan Dehneliler, Mehmet Erdem Iris
Summary: This study aims to improve the bonding behavior of fiber reinforced polymer composite joints by coating them with electrospun nanofibers on the prepreg surfaces. The experimental results show that the bonding strength of the joints is improved by about 40% with the presence of electrospun nanofibers, enhancing the adhesion performance of the composite joints.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Materials Science, Composites
Hande Iplikci, Murat Barisik, Ceren Turkdogan, Seckin Martin, Melisa Yeke, Kaan Nuhoglu, Gozde Esenoglu, Metin Tanoglu, Engin Aktas, Serkan Dehneliler, Mehmet Erdem Iris
Summary: The removal of contaminants and top polymer layer from the surface of Carbon-Fiber-Reinforced Polymer (CFRP) composites is crucial for achieving high-quality adhesive bonding with the reinforcing fiber constituents. Laser beam surface treatment offers a selective removal of the polymer matrix while preserving the fibers and improving wettability. However, the heterogeneous thermal properties of CFRP make it challenging to control laser ablation, as the absorbed laser energy is converted into heat and conducted through the fiber structures. This study characterizes the effects of scanning speed and laser power on nanosecond laser surface treatment, and determines the optimal processing parameters for complete removal of epoxy matrix without damaging the carbon fibers.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Engineering, Chemical
Kaan Nuhoglu, Engin Aktas, Metin Tanoglu, Seckin Martin, Hande Iplikci, Murat Barisik, Melisa Yeke, Ceren Turkdogan, Gozde Esenoglu, Serkan Dehneliler, Mehmet Erdem Iris
Summary: The aim of this study is to validate and evaluate the adhesive bonding behavior of laser surface-treated CFRP composite structures. Both experimental and numerical analyses were conducted using the finite element technique to predict the failure load and damage growth. A macro-scale 3D FEA with the Cohesive Zone Model (CZM) technique was developed to simulate the bonding behavior in composite structures, especially the skin-spar relation in the aircraft wing-box.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Chemistry, Multidisciplinary
Gozde Esenoglu, Metin Tanoglu, Murat Barisik, Hande Iplikci, Melisa Yeke, Kaan Nuhoglu, Ceren Turkdogan, Sekin Martin, Engin Aktas, Serkan Dehneliler, Ahmet Ayberk Gurbuz, Mehmet Erdem Iris
Summary: In this study, PA66 nanofibers produced by electrospinning were coated on carbon/epoxy prepregs to enhance the bond strength of the composites. The results showed that the coating substantially improved the shear strength, impact strength, and fracture toughness of the joints.
Article
Chemistry, Multidisciplinary
H. Gokberk Ozcelik, Ezgi Satiroglu, Murat Barisik