Multi-scale two-domain numerical modeling of stationary positive DC corona discharge/drift-region coupling

Monrolin, Nicolas; Plouraboué, Franck

doi:10.1016/j.jcp.2021.110517

Cited by 6 publications

(4 citation statements)

References 49 publications

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“…Most of the photons responsible for this photoionization originate from the near electrode region, where the electron density and electric field are maximized (Naidis 2005). Interest in further research on positive corona discharges has increased in recent years due to the need to better understand the inception conditions of a cylindrical corona as a function of gas pressure and humidity (Mikropoulos and Zagkanas 2015) and investigations of the electro-hydro-dynamic effects of a cylindrical corona including coupled inner/glow and outer/drift regions (Monrolin et al 2018, Monrolin andPlouraboue 2021). There is a significant interest in corona discharges in geophysics, as these are directly linked to the physics of lightning, and in particular, the lightning initiation problem.…”

Section: Introductionmentioning

confidence: 99%

Investigation of conditions necessary for inception of positive corona in air based on differential formulation of photoionization

Pasko

Janalizadeh

Jánský

2023

Plasma Sources Sci. Technol.

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Sharp point electrodes generate significant electric field enhancements where electron impact ionization leads to formation of electron avalanches that are seeded by photoionization. Photoionization of molecular oxygen due to extreme ultraviolet emissions from molecular nitrogen is a fundamental process in the inception of positive corona in air. In a positive corona system the avalanche of electrons in bulk of discharge volume is initiated by specific distribution of photoionization far away from region of maximum electron density near the electrode where those photons are emitted. Here we present a new approach to finding inception conditions of positive corona, that is based on differential formulation of the photoionization problem. The results are validated by comparisons with previous integral formulations and time dynamic plasma fluid solutions in planar and spherical geometries. The results illustrate ideas advanced in [Kaptzov,1950, p. 610] providing physically transparent connection between an effective secondary electron emission coefficient due to volume photoionization in the positive corona system and the secondary electron emission in conventional Townsend discharge theory. The results also demonstrate significance of boundary conditions for the accurate corona solutions which are based on differential formulation of photoionization. 

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Section: Introductionmentioning

confidence: 99%

Investigation of conditions necessary for inception of positive corona in air based on differential formulation of photoionization

Pasko

Janalizadeh

Jánský

2023

Plasma Sources Sci. Technol.

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“…DBD-based apparatuses are now used in a wide spectrum of scientific, industrial, and biomedical applications. The DBD shares many characteristics with the corona discharge, although the latter term is preferred for discharges between bare metal electrodes without solid dielectrics [3]. Due to the presence of one or more dielectric barriers between the electrodes and the gap, the design of DBD reactors can be optimized to achieve the discharge uniformity properties required for industrial surface treatments [4].…”

Section: Introductionmentioning

confidence: 99%

A Boltzmann Electron Drift Diffusion Model for Atmospheric Pressure Non-Thermal Plasma Simulations

Popoli,

Ragazzi,

Pierotti

et al. 2023

Plasma

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We introduce a fluid computational model for the numerical simulation of atmospheric pressure dielectric barrier discharge plasmas. Ion and neutral species are treated with an explicit drift diffusion approach. The Boltzmann relation is used to compute the spatial distribution of electrons as a function of the electrostatic potential and the ionic charge density. This technique, widely used to speed up particle and fluid models for low-pressure conditions, poses several numerical challenges for high-pressure conditions and large electric field values typical of applications involving atmospheric-pressure plasmas. We develop a robust algorithm to solve the non-linear electrostatic Poisson problem arising from the Boltzmann electron approach under AC electric fields based on a charge-conserving iterative computation of the reference electric potential and electron density. We simulate a volumetric reactor in dry air, comparing the results yielded by the proposed method with those obtained when the drift diffusion approach is used for all charged species, including electrons. We show that the proposed methodology retains most of the physical information provided by the reference modeling approach while granting a substantial advantage in terms of computation time.

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Section: Introductionmentioning

confidence: 99%

“…Nevertheless, it is hard to realize the direct measurement of the charged particle concentration and electric field distribution in the vicinity of needle electrode, due to the complex electromagnetic environment [18][19][20][21][22][23][24]. Thus, numerical simulation has been widely adopted in the current research, owing to its convenience, flexibility and low cost [25,26].To date, there are mainly three widely used simulation methods, including chemical kinetic model, hydrodynamic fluid model and ions flow transport equation [17,[27][28][29]. They have demonstrated a prominent advantage in dealing with a wide range of situations, involving active particles [17], thunder and Dingchen Li and Chuan Li contributed equally to this work.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.…”

mentioning

confidence: 99%

Dividing and setting strategy of improving calculation efficiency for needle electrode corona discharge with a large‐scale space

et al. 2021

High Voltage

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Needle electrodes are widely used in the research of corona discharge. Aiming at the problem of needle electrode discharge in a large‐scale space (tens or even hundreds of centimetres), a hybrid model was proposed in the previous work. However, its indispensable multiple iterations result in huge computation and further limit its wide applications. Therefore, a strategy to improve the computing efficiency by setting initial values in different computational domains is put forward in this work. Three types of setting initial values (global constant, partition constant and partition exponent) are simulated and compared in detail. The calculation results show that the calculation efficiency can be increased by 1.4 times simply through setting initial values of charged particles as different constants for the divided subdomains, and further be improved by 4.3 times by setting those in the ionization region as an exponential distribution. The extension of the proposed strategy has also been discussed under various voltages, which shows that the results under other voltages can be quickly obtained based on the fitted coefficients under a specific voltage, and the improvement can reach up to 10 times. The accuracy of calculated results has been demonstrated by a needle‐plate electrode device with a vertical distance of 25 cm. This research provides an effective strategy for improving the computing efficiency of corona discharge in a large‐scale space, and implies the potential in optimizing the analyses of complex electrodes.

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Multi-scale two-domain numerical modeling of stationary positive DC corona discharge/drift-region coupling

Cited by 6 publications

References 49 publications

Investigation of conditions necessary for inception of positive corona in air based on differential formulation of photoionization

Investigation of conditions necessary for inception of positive corona in air based on differential formulation of photoionization

A Boltzmann Electron Drift Diffusion Model for Atmospheric Pressure Non-Thermal Plasma Simulations

Dividing and setting strategy of improving calculation efficiency for needle electrode corona discharge with a large‐scale space

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