Pressure in underwater spark discharge initiated with the help of bubble injection and its evaluation based on H-alpha line broadening
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F23%3A00584035" target="_blank" >RIV/61389021:_____/23:00584035 - isvavai.cz</a>
Result on the web
<a href="https://iopscience.iop.org/article/10.1088/1361-6463/accaf3" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6463/accaf3</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1361-6463/accaf3" target="_blank" >10.1088/1361-6463/accaf3</a>
Alternative languages
Result language
angličtina
Original language name
Pressure in underwater spark discharge initiated with the help of bubble injection and its evaluation based on H-alpha line broadening
Original language description
The pressure in an underwater discharge channel is the main parameter that influences all its applications. In this study, we investigate a relatively large gap with a plane-to-plane electrode geometry that uses the assistance of an injected gas bubble for breakdown. The delay in the application of high voltage following the injection of a gas bubble from a grounded electrode determines the initial dimensions of the bubble. We examined three types of discharge: (a) a large bubble with easy triggering, (b) a medium bubble, and (c) a small bubble with difficult triggering. The main diagnostic tool is H α line broadening. It is shown that (i) Doppler broadening plays no role, (ii) at pressure broadening, the resonance and van der Waals broadenings must be considered, (iii) the impact approximation is not applicable, and hence the quasi-static high-pressure (namely ‘nearest neighbour’) approximation must be used, and (iv) the Stark broadening plays the dominant role. Because a mixture of two gases (evaporated water vapour and nitrogen from bubble injection) is present in the discharge channel, simple thermodynamic considerations were applied to estimate the ratio of the contributions of resonance and van der Waals broadening. The larger the bubble, the smaller the pressure detected in the discharge channel. This is in agreement with the measurements of the pressure wave amplitude at a certain distance from the discharge channel using a piezoelectric pressure probe.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - 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)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Physics D-Applied Physics
ISSN
0022-3727
e-ISSN
1361-6463
Volume of the periodical
56
Issue of the periodical within the volume
28
Country of publishing house
US - UNITED STATES
Number of pages
13
Pages from-to
285201
UT code for WoS article
000977106300001
EID of the result in the Scopus database
2-s2.0-85154618982