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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60162694%3AG43__%2F24%3A00560205" target="_blank" >RIV/60162694:G43__/24:00560205 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1361-6595/ace6d0" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6595/ace6d0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6595/ace6d0" target="_blank" >10.1088/1361-6595/ace6d0</a>

Result language

angličtina

Original language name

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

Original language description

Sharp point electrodes generate significant electric field enhancements where electron impact ionization leads to the 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 a positive corona in air. In a positive corona system, the avalanche of electrons in the bulk of the discharge volume is initiated by a specific distribution of photoionization far away from the region of maximum electron density near the electrode where these photons are emitted. Here, we present a new approach to finding the inception conditions for a positive corona, which is based on a differential formulation of the photoionization problem. The proposed iterative solution considers the same inception problem that has been solved in the existing literature by using either an integral approach to photoionization or a differential formulation of photoionization and considering the inception problem as a boundary-value eigenvalue 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 Elektricheskiye Yavleniya v Gazakh i Vacuume p 610) providing a physically transparent connection between an effective secondary electron emission coefficient due to volume photoionization in a positive corona system and the secondary electron emission in conventional Townsend discharge theory. The results also demonstrate the significance of boundary conditions for accurate corona solutions that are based on a differential formulation of photoionization.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

PLASMA SOURCES SCIENCE & TECHNOLOGY

ISSN

0963-0252

e-ISSN

1361-6595

Volume of the periodical

32

Issue of the periodical within the volume

7

Country of publishing house

GB - UNITED KINGDOM

Number of pages

12

Pages from-to

075014

UT code for WoS article

001036266900001

EID of the result in the Scopus database

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