Detailed Information on Publication Record
2016
Electric field measurements in a kHz-driven He jet-the influence of the gas flow speed
SOBOTA, A., O. GUAITELLA, G. B. SRETENOVIC, I. B. KRSTIC, V. V. KOVACEVIC et. al.Basic information
Original name
Electric field measurements in a kHz-driven He jet-the influence of the gas flow speed
Authors
SOBOTA, A. (528 Netherlands), O. GUAITELLA (250 France), G. B. SRETENOVIC (688 Serbia), I. B. KRSTIC (688 Serbia), V. V. KOVACEVIC (688 Serbia), Adam OBRUSNÍK (203 Czech Republic, belonging to the institution), Y. N. NGUYEN (528 Netherlands), Lenka ZAJÍČKOVÁ (203 Czech Republic, guarantor, belonging to the institution), B. M. OBRADOVIC (688 Serbia) and M. M. KURAICA (688 Serbia)
Edition
PLASMA SOURCES SCIENCE & TECHNOLOGY, BRISTOL, IOP PUBLISHING LTD, 2016, 0963-0252
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10305 Fluids and plasma physics
Country of publisher
United Kingdom of Great Britain and Northern Ireland
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
Impact factor
Impact factor: 3.302
RIV identification code
RIV/00216224:14740/16:00093938
Organization unit
Central European Institute of Technology
UT WoS
000388926700002
Keywords in English
discharge; plasma jet; atmospheric pressure; helium; ionization front; plasma bullet; electric field
Tags
Tags
International impact, Reviewed
Změněno: 19/9/2017 04:53, doc. Mgr. Lenka Zajíčková, Ph.D.
Abstract
V originále
This report focuses on the dependence of electric field strength in the effluent of a vertically downwards-operated plasma jet freely expanding into room air as a function of the gas flow speed. A 30 kHz AC-driven He jet was used in a coaxial geometry, with an amplitude of 2 kV and gas flow between 700 sccm and 2000 SCCM. The electric field was measured by means of Stark polarization spectroscopy of the He line at 492.19 nm. While the minimum and the maximum measured electric fields remained unchanged, the effect of the gas flow speed is to cause stretching of the measured profile in space-the higher the flow, the longer and less steep the electric field profile. The portion of the effluent in which the electric field was measured showed an increase of electric field with increasing distance from the capillary, for which the probable cause is the contraction of the plasma bullet as it travels through space away from the capillary. There are strong indications that the stretching of the electric field profile with increase in the flow speed is caused by differences in gas mixing as a function of the gas flow speed. The simulated gas composition shows that the amount of air entrained into the gas flow behaves in a similar way to the observed behaviour of the electric field. In addition we have shown that the visible length of the plasma plume is associated with a 0.027 molar fraction of air in the He flow in this configuration, while the maximum electric field measured was associated with a 0.014 molar fraction of air at gas flow rates up to 1500 SCCM (4.9 m s(-1)). At higher flows vortices occur in the effluent of the jet, as seen in Schlieren visualization of the gas flow with and without the discharge.
Links
| LQ1601, research and development project |
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