Absorption spectroscopy measurements of argon metastable and resonant atom density in atmospheric pressure Ar-He surface-wave plasmas using a low pressure lamp

2012 ◽  
Vol 111 (2) ◽  
pp. 023303 ◽  
Author(s):  
J. Muñoz ◽  
J. Margot ◽  
M. D. Calzada
Keyword(s):  
Surface Wave ◽  
Absorption Spectroscopy ◽  
Atmospheric Pressure ◽  
Low Pressure ◽  
Atom Density ◽  
Resonant Atom

Detoxification of Trichloroethylene in a Low-Pressure Surface Wave Plasma Reactor

1996 ◽  
Vol 30 (8) ◽  
pp. 2427-2431 ◽  
Author(s):  
Josep Arnó ◽  
John W. Bevan ◽  
Michel Moisan
Keyword(s):  
Surface Wave ◽  
Plasma Reactor ◽  
Low Pressure ◽  
Pressure Surface

Plasma agriculture based on quantitative monitoring of reactions between fungal cells and atmospheric-pressure plasmas

2012 ◽  
Vol 1469 ◽  
Author(s):  
Masafumi Ito ◽  
Takayuki Ohta ◽  
Keigo Takeda
Keyword(s):  
Uv Radiation ◽  
Absorption Spectroscopy ◽  
Ground State ◽  
Atmospheric Pressure ◽  
Atomic Oxygen ◽  
Fungal Spores ◽  
Ultra Violet ◽  
High Density ◽  
Inactivation Rate ◽  
The Absolute

ABSTRACTA high-density non-equilibrium atmospheric pressure plasma (NEAPP) applied for inactivating fungal spores of P. digitatum is introduced as an environmentally safe and rapid-inactivation method. The contributions of ozone, ultra violet (UV) radiation and ground-state atomic oxygen in the NEAPP on the inactivation of the spores are evaluated using colony count method.The absolute densities of ozone were measured by using ultraviolet absorption spectroscopy. The ozone density increased from 2 to 8 ppm with an increase in the distance from the plasma source, while the inactivation rate decreased. The inactivation rate of plasma was evaluated to be thousand times higher than that of an ozone generator using the integrated number density of ozone. In addition, it was clarified that the contribution of UV radiation to inactivation was not dominant for P. digitatum inactivation by NEAPP by filtering the active species using quartz plate. From these results, we can speculate that the inactivation efficiency of reactive oxygen species (ROS) will be larger than those of others.In order to investigate the effect of ground-state atomic oxygen as one of ROS, the inactivation of P. digitatum spores using an oxygen radical source that employs a high-density atmospheric-pressure O2/Ar plasma. The absolute O density was measured to be 1.4×1014 and 1.5×1015 cm–3 using vacuum ultra violet absorption spectroscopy (VUVAS) using a microdischarge hollow cathode lamp. The behaviors of the O densities as a function of O2/(Ar+O2) mixture flow rate ratio correspond to that of the inactivation rate. This result indicates that ground-state atomic oxygen is concluded to be the dominant species that causes inactivation.

Electron Density and Gas Temperature from Line Broadening in an Argon Surface-Wave-Sustained Discharge at Atmospheric Pressure

2004 ◽  
Vol 58 (9) ◽  
pp. 1032-1037 ◽  
Author(s):  
M. Christova ◽  
E. Castaños-Martinez ◽  
M. D. Calzada ◽  
Y. Kabouzi ◽  
J. M. Luque ◽  
...  
Keyword(s):  
Surface Wave ◽  
Electron Density ◽  
Atmospheric Pressure ◽  
Gas Temperature ◽  
Line Broadening ◽  
Sustained Discharge

scholarly journals Experimental study on the effect of spray cone angle on the characteristics of horizontal jet spray flame under sub-atmospheric pressure

2020 ◽  
Vol 24 (5 Part A) ◽  
pp. 2941-2952 ◽  
Author(s):  
Kai Xie ◽  
Xingqi Qiu ◽  
Yunjing Cui ◽  
Jianxin Wang
Keyword(s):  
Atmospheric Pressure ◽  
Cone Angle ◽  
Flame Temperature ◽  
Normal Pressure ◽  
Low Pressure ◽  
Dimensionless Temperature ◽  
Thermal Imager ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Matlab Programming

The burning state of a plateau environment is attracting more and more attention. In this paper, in order to have a deeper scientific understanding of diesel spray combustion and the characteristics of a flame under different spray cone angles in a plateau environment, experiments were carried out in a low pressure chamber. The flame morphology was recorded by a high speed video instrument, and the temperature change was recorded by a thermal imager and thermocouples. The MATLAB programming was used to process the video image of the flame, and the probability of its binarization was calculated. The results indicate that the flame becomes longer and wider under different pressures with the same spray angle. The variation is more pronounced at a smaller spray taper angle. The flame uplifted height characteristic is mainly negatively related to the atmospheric pressure. According to the normalized flame temperature and the dimensionless horizontal projection, the length can be divided into three regions. In the region of buoyancy flame, the dimensionless temperature varies with sub-atmospheric pressure more than with normal pressure. In addition, under different spray cone angle conditions, the law of variation in the normalized flame temperature under sub-atmospheric pressure is exactly opposite to that under normal pressure. This study is of great significance to the scientific research on flames in a low pressure environment, and the design of different fuel nozzles for application in a plateau environment.

Electron Density in Atmospheric Pressure Microwave Surface Wave Discharges

2008 ◽  
Author(s):  
M. Jasinski ◽  
Z. Zakrzewski ◽  
J. Mizeraczyk ◽  
Hans-Jürgen Hartfuss ◽  
Michel Dudeck ◽  
...  
Keyword(s):  
Surface Wave ◽  
Electron Density ◽  
Atmospheric Pressure
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