A chemical kinetics model is developed to analyze the time evolution of different main species involved in a flue gas initially stressed by pulsed corona discharge at atmospheric pressure and including N2, O2, H2O, CO2 with few ppm NO. The present coupled dynamics used radial expansion ionized channel created during phase. It also meant heating due Joule effect. This charged particle models based on Boltzmann equation calculate electron-molecule reaction coefficients Monte Carlo code...

We present and compare six simulation codes for positive streamer discharges from different research groups. Four groups use a fully self-implemented code two make of COMSOL Multiphysics®. Three test cases are considered, in which axisymmetric streamers simulated dry air at 1 bar 300 K an undervolted gap. All the same fluid model with transport coefficients. The first case includes relatively high background density electrons ions without photoionization. When each group uses their standard...

This work is devoted to fluid modeling based on experimental investigations of a classical setup low-temperature plasma jet. The latter generated at atmospheric pressure using quartz tube small diameter crossed by helium gas flow and surrounded an electrode system powered mono-polar high-voltage pulse. streamer-like behavior the fast bullets or ionization waves launched in ambient air for every pulse, already emphasized literature from analytical considerations recent preliminary models,...

Two plasma devices at atmospheric pressure (air dielectric barrier discharge and helium jet) have been used to study the early germination of Arabidopsis thaliana seeds during first days. Then, activated waters are later stage plant development growth until 42 The effects on both testa endospserm ruptures significant in case air due its higher energy efficiency producing reactive oxygen species than plasma. latter has shown distinct only for rupture. Analysis stimulations based specific...

This paper is mainly devoted to the comparison between calculation and experimental results of primary secondary streamer development in a point-to-plane positive corona discharge dry air at atmospheric pressure. The qualitative agreement based on hydrodynamics approximation shows that O radical produced which good with recent literature measurements using TALIF diagnostics. However, production yield (in terms radicals per energy injected) more efficient than one. main characteristics are...

Biomedical applications of low-temperature plasmas are growing interest, especially in the field plasma-induced anti-tumor effects. The present work is aimed at investigating regionalized antiproliferative effects on a multicellular tumor spheroid (MCTS), model that mimics 3D organization and regionalization microtumor region. We report plasma jet, using helium flow open air, inhibits HCT116 colon carcinoma MCTS growth dose-dependent manner. This inhibition associated with loss Ki67,...

Two different categories of high-order numerical methods are adopted for the electro-hydrodynamic modeling streamer: finite-element method (FEM) with flux-corrected-transport (FCT) technique and finite-volume (FVM) monotonic upwind-centered scheme conservation-law (MUSCL) algorithm. Specific tests on transport equation used to investigate efficiency two propagate sharp density gradients in stationary uniform nonuniform velocity fields. The streamer simulations performed a positive...

Abstract In order to investigate the effects of low temperature plasmas on germination Arabidopsis thaliana seeds, a dielectric barrier discharge device generating plasma in ambient air was used. To highlight different seed surface, saline and osmotic stresses were considered case reference Col-0 seeds two further coat mutants gl2 gpat5 better analyse surface changes their consequences germination. The GL2 gene encode transcription factor controlling balance between biosynthesis fatty acids...

An improved Monte Carlo method is developed for the simulation of ion transport in classical drift tube case ion-molecule asymmetric systems such as O−/O2 or N+/N2. The aim this new to overcome problem incident ions which vanish at relative high electric field due charge transfer electron detachment. These removal processes are compensated by a fictitious creation improves accuracy distribution function and swarm coefficient calculations. collision occurring weakly ionized gases room...

Abstract This work is devoted to the evaluation of efficiency a new low-temperature plasma jet driven in ambient air by dc-corona discharge inactivate adherent cells and biofilms Gram-positive bacteria. The selected microorganisms were lactic acid bacteria, Weissella confusa strain which has particularity excrete polysaccharide polymer (dextran) when sucrose present. Both treated with for different exposure times. antimicrobial was tested against 48 h-old grown or without sucrose. Bacterial...

In this work we experimentally examine the characteristics of a dielectric barrier discharge reactor driven by two distinct pulsed high voltage (HV) generators. Firstly, operation under HV generator delivering positive pulses with short (tenths ns) rise and fall times in low (up to 100 Hz) repetition frequency is illustrated. Then DBD obtain use bipolar larger range (several tenths kHz) having microsecond scale depicted. unipolar excitation regime discharges per pulse occur: first one during...

A non-stationary reactive gas dynamics model in a mono-dimensional geometry, including radial mass diffusion, temperature variation and chemical kinetics, is developed this paper. The aim to analyse the spatio-temporal evolution of main neutral species involved corona discharge used for NO pollution control polluted air at atmospheric pressure ambient temperature. present takes into account 16 (including certain metastable species) reacting following 110 selected reactions. initial...

This paper presents an experimental analysis of the electrical behavior positive point-plane corona discharges. The current, streamer velocity, mean discharge frequency, and current-voltage characteristic are studied, firstly in synthetic air as a function parameters such gap distance tip radius. Different diagnostics used order to better understand development well dependence its characteristics on previous listed parameters. Then influence gas mixture (several proportions N2 O2 with or...

This work is devoted to the analysis of experimental results obtained in dry air at atmospheric pressure a positive point-to-plane corona discharge under pulsed applied voltage cases anodic mono- and multi-tips. In mono-tip case, peak current analysed as function several parameters such magnitude, frequency duration gap distance. The variation correlated with ozone production. Then multi-tip electrical behaviour distance between two contiguous tips tip number order highlight region creation...

This paper concerns the 3D simulation of corona discharge using high performance computing (HPC) managed with message passing interface (MPI) library. In field finite volume methods applied on non-adaptive mesh grids and in case a specific dynamic benchmark test devoted to streamer studies, great efficiency iterative R&B SOR BiCGSTAB versus direct MUMPS method was clearly demonstrated solving Poisson equation HPC resources. The optimization parallelization resulting scalability undertaken as...

The first step of this work is the determination elastic and inelastic ion-molecule collision cross sections for main ions (N2+, O2+, CO2+, H2O+ O−) usually present either in air or flue gas discharges. obtained section sets, given ion kinetic energies not exceeding 100 eV, correspond to interactions each with its parent molecule (symmetric case) nonparent (asymmetric case). Then by using these different it possible obtain swarm data mixtures involving N2, CO2, H2O O2 molecules whatever...

The present paper shows that in the case of a micro-discharge modelling using hydrodynamics assumption, second order fluid model involving complete electron momentum conservation equation must be used to better quantify radical formation applied air pollution control. results show large differences parameters (such as velocity and density) between three tested models: classical first local electric field approximation two models energy with or without drift–diffusion approximation. tests...

This paper deals with atmospheric pressure DBDs driven under unipolar and bipolar pulsed excitation, in a context of chemical reactivity flowing afterglow conditions. The resulting discharges air nitrogen are examined via electrical optical diagnostics. Then, their yield the production active species (ozone for afterglow-atomic Nitrogen N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ( <i...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Preliminary comparisons between numerical simulation and experimental results are obtained under pulsed applied voltages in the case of positive point to plane corona discharges dry air at atmospheric pressure. The conditions correspond 7 mm interelectrode distances with a tip radius 20 <formula formulatype="inline"><tex>$\mu\hbox{m}$</tex></formula>. calculations based on first-order 2-D...

Abstract This paper is a contribution to the fluid modelling and simulation of spontaneous branching an initial mono-filamentary negative streamer propagating in molecular nitrogen at atmospheric pressure. The effects both numerical diffusion physical anisotropic on structure are studied. We used MUSCL-type flux limiters where artificial amount can be introduced through choice value characteristic slope parameter. It was shown that small inhibit branching. means use high-order scheme...

The ion swarm data, namely, the reduced mobility, diffusion, and reaction rates of positive tetratomic ions O4+ N2O2+ in N2 O2 have been determined from a Monte Carlo simulation using calculated fitted elastic inelastic cross sections. momentum transfer sections semiclassical Jeffreys-Wentzell-Kramers-Brilouin (JWKB) approximation based on rigid core potential model well adapted for polyatomic ions. approximated considerations N4+/O2 N4+/N2 systems. validated section sets pure used to...

This paper is devoted to the simulation of thermal shock and induced pressure-waves expansion, generated by a dc pin-to-plan corona discharge in air at ambient temperatures under atmospheric pressure. The positive voltage applied tip generates monofilamentary streamer that crosses gap from toward plan. models are based on coupling 2-D dynamics model with hydrodynamics conservation equations compressible gas. source term for gas takes into account fast-energy relaxation excited molecules...

The comprehension of electromagnetic perturbations electronic devices, due to air plasma-induced field, requires a thorough study on plasma. In the aim understand phenomena at origin formation non-equilibrium plasma, we simulate, using volume average chemical kinetics model (0D model), time evolution plasma generated by an energetic X-ray flash. simulation is undertaken in synthetic (80% N2 and 20% O2) ambient temperature atmospheric pressure. When flash crosses gas, non-relativistic Compton...