Article
Chemistry, Multidisciplinary
Jacob Manzi, Ariel E. E. Weltner, Tony Varghese, Nicholas McKibben, Mia Busuladzic-Begic, David Estrada, Harish Subbaraman
Summary: This paper demonstrates the use of plasma-jet printing (PJP) to deposit thermoelectric nanoflakes onto flexible substrates at room temperature, with substantial improvements in material adhesion and flexibility observed. The printed films exhibit electrical conductivity of 2.5 x 10(3) S m(-1) and a power factor of 70 mu W m(-1) K-2 at room temperature. This advancement in plasma jet printing promotes not only the development of energy harvesting but also large-scale flexible electronics and sensors for space and commercial applications.
Article
Physics, Fluids & Plasmas
Yutian Yu, Li Wu, Qiang Chen, Naoki Shinohara, Kama Huang
Summary: This paper presents a numerical model to simulate the motion trajectory of an atmospheric pressure plasma jet under an external nonuniform electric field. The model treats the plasma jet as equivalent particles based on its dielectric properties and motion characteristics. The model demonstrates short calculation times and excellent agreement with experimental observations, providing an effective and efficient method for predicting and controlling plasma jet motion trajectory.
Article
Physics, Applied
Peng Lin, Jiao Zhang, Tam Nguyen, Vincent M. Donnelly, Demetre J. Economou
Summary: This study investigated the discharge characteristics of an atmospheric pressure plasma jet (APPJ) with coaxial shielding gas through numerical simulation. The presence of nitrogen shielding gas hindered the diffusion of oxygen and argon into the helium jet, leading to a shorter plasma plume. The radial profiles of ambient gas mole fractions in the APPJ exhibited a decreasing trend towards the system axis at shorter axial distances, but became flatter at longer distances.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
J. Liu, L. Nie, Y. Xian, X. Lu
Summary: The study found that adding a small amount of nitrogen or oxygen to argon can make the plasma channel smooth, while the rotational frequency of the electrode does not affect the appearance of the plasma channel. Optical emission spectra show that adding O-2/N-2 reduces the emission intensity of transitions from excited argon levels to metastable states, leading to a transition of the discharge channel's nature.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Jia-Shiuan Tsai, Jian-Zhang Chen
Summary: This study investigated the impact of oxygen impurity on the inlet gas in a nitrogen atmospheric pressure plasma jet (APPJ). A numerical model was developed to simulate the nitrogen APPJ considering fluid dynamics, heat transfer, mass transfer, diffusion, and chemical reactions. Experimental tests were conducted to verify the plasma temperature characteristics on the treated surface. The findings revealed that the plasma temperature decreased with increasing oxygen impurity, affecting the excited and neutral species composition.
APPLIED SCIENCES-BASEL
(2023)
Article
Physics, Fluids & Plasmas
Ghada Barkaoui, Ahlem Ben Halima, Neil Jomaa, Kamel Charrada, Mohamed Yousfi
Summary: A numerical simulation of a plasma jet operating in argon gas and launched in the open air using COMSOL Multiphysics software is developed in this study, considering three coupled models of hydrodynamics, electrostatics, and plasma. The results are validated by comparing them to measurements in the literature, showing good agreement and corresponding to the physics of the plasma jet.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2021)
Article
Physics, Applied
K. Gazeli, M. Hadjicharalambous, Eleftherios Ioannou, O. Gazeli, C. Lazarou, C. Anastassiou, P. Svarnas, V. Vavourakis, G. E. Georghiou
Summary: We developed an in silico model to simulate the response of B16F10 melanoma cells to a helium atmospheric pressure plasma jet (APPJ) and doxorubicin drug (DOX). The simulation results showed that increasing plasma duration and DOX concentration resulted in increased cytotoxicity and a higher apoptosis probability compared to mitosis probability. Furthermore, combining plasma treatment and drug application enhanced cell cytotoxicity. This in silico model is valuable in the field of plasma medicine for understanding the response of different cancers to APPJ and cancer drugs.
APPLIED PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Nazli Turan, Mortaza Saeidi-Javash, Jiahao Chen, Minxiang Zeng, Yanliang Zhang, David B. Go
Summary: The passage discusses the application of atmospheric pressure nonthermal plasmas in sintering printed films, demonstrating the surface modifications achieved through nonthermal plasmas under ambient conditions. These results offer a new direction for future electronic device manufacturing, showcasing the potential of utilizing nonthermal plasmas for additive manufacturing on flexible and low-melting-point materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Jingkai Jiang, V. S. Santosh K. Kondeti, Gaurav Nayak, Peter J. Bruggeman
Summary: This study presents a detailed comparison between modeling and experimental results to elucidate the plasma chemistry in a humid atmospheric pressure plasma jet. It is found that there is a significant difference in the measured concentration of H due to boundary layer effects. Additionally, the model underestimates the concentration of H and O-2, and overestimates the concentration of H2O2. These findings provide insights into the H2O vapor chemistry in low-temperature plasmas.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Multidisciplinary
Keita Shimada, Ryuki Morita, Masayoshi Mizutani, Tsunemoto Kuriyagawa
Summary: Powder jet deposition (PJD) is a spray coating method that can be done under atmospheric pressure and room temperature. By applying an atmospheric-pressure plasma jet (APPJ) assistance, the deposition rate of PJD can be increased.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2023)
Article
Mechanics
Xuechen Li, Dongdong Wang, Junyu Chen, Jiacun Wu, Na Zhao, Pengying Jia, Kaiyue Wu
Summary: The study focuses on the behavior of an inert gas plasma jet operating in a streamer discharge mechanism and its interaction with positive ions clouds of different densities and scales. Results show that the streamer behavior is influenced by the density of positive ions, with rarefied ions resulting in free propagation and denser ions causing detouring paths. The detouring process is achieved through the relay of two streamers initiated at different points within the system. Additionally, the study examines the velocity of the streamer and the deflection amplitude of the detouring track based on varying factors such as ion densities, voltage amplitudes, and gap widths.
Article
Physics, Applied
Li Wu, Xianyu Zhang, Tao Liu, Wencong Zhang, Junwu Tao, Fei Cheng
Summary: This Letter presents an atmospheric pressure low power microwave-induced air plasma source operating at 2.45 GHz. The device can self-ignite air and generate plasma with only 50 W microwave input power, without any additional trigger. Its sustaining power is as low as 10 W, and the gas temperature of plasma tail flame is about 32 degrees C measured by a fiber optic thermometer. Spectroscopic measurements revealed the presence of strong OH(A(2)S(+)? X-2?) bands at 306-310 nm and oxygen atomic lines O-I (3p5P? 3s5S) at 777.1 nm and O-I (3p3P?3s3S) at 844.6 nm. Furthermore, NO- ?(A(2)S(+)?X-2?(r)) from 200 to 300 nm was also detected in the air plasma jet. This portable plasma apparatus shows potential for air plasma applications in the biomedical fields.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Chemical
Li Lv, Tao Wang, Jia-Hao Wang, Sheng-Quan Wang, Li-Ping Shi, Meng Li, Si-Le Chen, De-Yu Tu
Summary: This paper investigates the problem of atmospheric pressure cold plasma jet etching. A diffusion limited etching model is established, and numerical simulation and experimental verification are conducted. The results show that the greater the probability of downward movement of active particles, the more obvious the etching results. The shielding gas can reduce particle loss, which is beneficial to the etching process.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2022)
Article
Engineering, Chemical
Wameedh Adress, W. G. Graham
Summary: In this study, the influences of electrode geometrical shapes on the optical properties of two non-thermal atmospheric pressure plasma jets were investigated. The results demonstrated the role of low temperature plasma in catalysis, showing a significant enhancement in conversion activity at low activation temperatures compared to conventional thermal activation.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2022)
Article
Automation & Control Systems
Dogan Gidon, Hossam S. Abbas, Angelo D. Bonzanini, David B. Graves, Javad Mohammadpour Velni, Ali Mesbah
Summary: Cold atmospheric plasmas are increasingly used for treatment of complex surfaces in biomedical and biomaterials processing applications, but their operation is challenging due to their complex dynamics and interactions, as well as sensitivity to disturbances. This paper proposes a data-driven LPV modeling framework and a hierarchical LPV-MPC control strategy to regulate the thermal effects of plasma on a surface, demonstrating effectiveness in real-time control experiments.
CONTROL ENGINEERING PRACTICE
(2021)
Article
Physics, Fluids & Plasmas
P. K. Papadopoulos, D. Athanasopoulos, K. Sklias, P. Svarnas, N. Mourousias, K. Vratsinis, P. Vafeas
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2019)
Article
Engineering, Multidisciplinary
Theodosis D. Tsaousis, Polycarpos K. Papadopoulos, Ioannis K. Chatjigeorgiou
APPLIED MATHEMATICAL MODELLING
(2020)
Article
Environmental Sciences
P. Svarnas, E. Giannakopoulos, I. Kalavrouziotis, C. Krontiras, S. Georga, R. S. Pasolari, P. K. Papadopoulos, I. Apostolou, D. Chrysochoou
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Nuclear Science & Technology
G. P. Vafakos, P. K. Papadopoulos
FUSION ENGINEERING AND DESIGN
(2020)
Article
Multidisciplinary Sciences
P. Vafeas, P. K. Papadopoulos, G. P. Vafakos, P. Svarnas, M. Doschoris
SCIENTIFIC REPORTS
(2020)
Article
Nanoscience & Nanotechnology
R. S. Pasolari, P. K. Papadopoulos, P. Svarnas, E. Giannakopoulos, I. Kalavrouziotis, S. Georga, C. Krontiras
Article
Mathematics, Applied
Panayiotis Vafeas
STUDIES IN APPLIED MATHEMATICS
(2020)
Article
Physics, Fluids & Plasmas
K. Gazeli, P. Svarnas, C. Lazarou, C. Anastassiou, G. E. Georghiou, P. K. Papadopoulos, F. Clement
PHYSICS OF PLASMAS
(2020)
Article
Energy & Fuels
Maria K. Koukou, Christos Pagkalos, George Dogkas, Michail Gr. Vrachopoulos, Eleni Douvi, Yannis G. Caouris, Polykarpos Papadopoulos
Summary: A numerical study investigated the performance of different phase change materials (PCMs) in a solar collector for thermal storage. The study found that the charging and discharging processes varied for different PCMs.
Article
Chemistry, Multidisciplinary
Viktoras Papadimas, Christos Doudesis, Panagiotis Svarnas, Polycarpos K. Papadopoulos, George P. Vafakos, Panayiotis Vafeas
Summary: The study has developed a single dielectric barrier discharge-based actuator that is energy-efficient and stable, suitable for different aerodynamic profiles. Experimental results show that the average gas temperature above the actuator surface is around 400K, with fluid velocity reaching up to 4.5m/s, and a laminar flow layer less than 1.5mm thick is observed on the actuator surface.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Interdisciplinary Applications
Georgios P. Vafakos, Angelos Kafkas, Polycarpos K. Papadopoulos
Summary: This study presents a new version of the pressure-based implicit potential (IPOT) method for incompressible flows, which can be applied on a fully collocated mesh. The new version combines the IPOT algorithm with the Rhie and Chow (RC) technique to produce solutions on collocated grids that are free of spurious pressure modes. The method retains all the benefits of the original algorithm and does not require a special grid topology. The study also discusses the cause of spurious oscillations in zero-div problems and proposes a possible cure linked to the RC technique. The method is validated through several benchmark problems.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2022)
Article
Engineering, Environmental
Evangelos Giannakopoulos, Panagiotis Svarnas, Stavroula Dimitriadou, Ioannis Kalavrouziotis, Polycarpos K. Papadopoulos, Stavroula Georga, Christoforos Krontiras
Summary: Biosolids contain high amounts of human pathogenic bacteria that are excreted in feces and urine, potentially causing zoonotic infections and showing strong environmental adaptability. An emerging process using atmospheric pressure air cold plasma of electrical discharges has shown effectiveness in destroying pathogenic cells of antibiotic-resistant bacteria like E. coli and Salmonella sp., providing a potential reduction in pathogenic microorganisms for the reuse of treated biosolids in agriculture.
JOURNAL OF HAZARDOUS TOXIC AND RADIOACTIVE WASTE
(2021)
Article
Physics, Fluids & Plasmas
Panteleimon A. Bakalis, Polycarpos K. Papadopoulos, Panayiotis Vafeas
Summary: The study examined the laminar fully developed ferrofluid flow and heat transfer in a vertical annular duct with circular cross-section, showing significant effects of magnetic field strength and particles' volumetric concentration on velocity distribution, pressure gradient, and heat transfer.
Article
Computer Science, Interdisciplinary Applications
Jin Bao, Zhaoli Guo
Summary: At the equilibrium state of a two-phase fluid system, the chemical potential is constant and the velocity is zero. However, it is challenging to capture this equilibrium state accurately in numerical simulations, resulting in inconsistent thermodynamic interfacial properties and spurious velocities. Therefore, numerical schemes with well-balanced properties are preferred for simulating two-phase flows.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Brian C. Vermeire
Summary: This study presents a framework for implicit large eddy simulation (ILES) of incompressible flows by combining the entropically damped artificial compressibility (EDAC) method with the flux reconstruction (FR) approach. Experimental results demonstrate that the method is accurate and stable for low-order solutions, while higher-order solutions exhibit significantly higher accuracy and lower divergence error compared to reference direct numerical simulation.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Mijian Li, Rui Wang, Xinyu Guo, Xinyu Liu, Lianzhou Wang
Summary: In this study, the flow mechanisms around wall-mounted structures were investigated using Large Eddy Simulation (LES). The impact of inflow turbulence on the flow physics, dynamic response, and hydrodynamic performance was explored. The results revealed strong interference between velocity fluctuations and the wake past the cylinder, as well as significant convection effects in the far wake region.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Donatella Passiatore, Luca Sciacovelli, Paola Cinnella, Giuseppe Pascazio
Summary: A high-order shock-capturing central finite-difference scheme is evaluated for numerical simulations of hyper-sonic high-enthalpy flows out of thermochemical equilibrium. The scheme utilizes a tenth-order accurate central-difference approximation of inviscid fluxes, along with high-order artificial dissipation and shock-capturing terms. The proposed approach demonstrates accuracy and robustness for a variety of thermochemical non-equilibrium configurations.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Philipp Bahavar, Claus Wagner
Summary: Condensation is an important aspect in flow applications, and simulating the gas phase and tracking the deposition rates of condensate droplets can capture the effects of surface droplets on the flow while reducing computational costs.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Andras Szabo, Gyorgy Paal
Summary: This paper introduces an efficient calculation method, the parabolized stability equations (PSE), for solving stability equations. By calculating LU factorization once in each marching step, the time spent on solving linear systems of equations can be significantly reduced. Numerical experiments demonstrate the effectiveness of this method in reducing the solution time for linear equations, and its applicability to similar problems.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
A. Khalifa, M. Breuer
Summary: This study evaluates a recently developed data-driven model for collision-induced agglomerate breakup in high mass loading flows. The model uses artificial neural networks to predict the post-collision behavior of agglomerates, reducing computational costs compared to coupled CFD-DEM simulations.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Chunmei Du, Maojun Li
Summary: This paper considers the bilayer shallow water wave equations in one-dimensional space and presents an invariant domain preserving DG method to avoid Kelvin-Helmholtz instability.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Jean-Michel Tucny, Mihir Durve, Andrea Montessori, Sauro Succi
Summary: The prediction of non-equilibrium transport phenomena in disordered media is a challenging problem for conventional numerical methods. Physics-informed neural networks (PINNs) show potential for solving this inverse problem. In this study, PINNs were used to successfully predict the velocity field of rarefied gas flow, and AdamW was found to be the best optimizer.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Min Gao, Pascal Mossier, Claus-Dieter Munz
Summary: In recent decades, the arbitrary Lagrangian-Eulerian (ALE) approach has gained popularity in dealing with fluid flows with moving boundaries. This paper presents a novel algorithm that combines the ALE finite volume (FV) and ALE discontinuous Galerkin (DG) methods into a stable and efficient hybrid approach. The main challenge of this mixed ALE FV and ALE DG method is reducing the inconsistency between the two discretizations. The proposed algorithm is implemented into a loosely-coupled fluid-structure interaction (FSI) framework and is demonstrated through various benchmark test cases and complex scenarios.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Dawid Strzelczyk, Maciej Matyka
Summary: In this study, the numerical convergence of the Meshless Lattice Boltzmann Method (MLBM) is investigated through three benchmark tests. The results are compared to the standard Lattice Boltzmann Method (LBM) and the analytical solution of the Navier-Stokes equation. It is found that MLBM outperforms LBM in terms of error value for the same number of nodes discretizing the domain.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Kanishka Bhattacharya, Tapan Jana, Amit Shaw, L. S. Ramachandra, Vishal Mehra
Summary: In this work, an adaptive algorithm is developed to address the issue of tensile instability in Smoothed Particle Hydrodynamics (SPH) by adjusting the shape of the kernel function to satisfy stability conditions. The effectiveness of the algorithm is demonstrated through dispersion analysis and fluid dynamics simulations.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Luis Laguarda, Stefan Hickel
Summary: We propose several enhancements to improve the accuracy and performance of the digital filter turbulent inflow generation technique, such as introducing a more realistic correlation function and varying target length scales. Additionally, we suggest generating inflow data in parallel at a prescribed time interval to improve computational performance. Based on the results of large-eddy simulations, these enhancements have shown to be beneficial. Suppressing streamwise velocity fluctuations at the inflow leads to the fastest relaxation of pressure fluctuations. However, this approach increases the adaptation length, which can be shortened by artificially increasing the wall-normal Reynolds stresses.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Constantin Zenz, Michele Buttazzoni, Tobias Florian, Katherine Elizabeth Crespo Armijos, Rodrigo Gomez Vazquez, Gerhard Liedl, Andreas Otto
Summary: A new model for compressible multiphase flows involving sharp interfaces and phase change is presented, with a focus on the treatment of compressibility and phase change in the multiphase fluid flow model. The model's accuracy and suitability are demonstrated through comparisons with experimental observations.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Joseph O'Connor, Sylvain Laizet, Andrew Wynn, Wouter Edeling, Peter V. Coveney
Summary: This article aims to apply uncertainty quantification and sensitivity analysis to the direct numerical simulation (DNS) of low Reynolds number wall-bounded turbulent channel flow. By using a highly scalable DNS framework and UQ techniques, the study evaluates the influence of different numerical parameters on the simulation results without explicitly modifying the code. The findings provide guidance for numerical simulations of wall-bounded turbulent flows.
COMPUTERS & FLUIDS
(2024)
