scholarly journals Diagnostics of Hybrid Water/Argon Thermal Plasma Jet with Water, Ethanol and Their Mixture Injection to Plasma

2016 ◽  
Vol 3 (2) ◽  
pp. 62-65 ◽  
Author(s):  
M. Hlina ◽  
A. Maslani ◽  
J. Medricky ◽  
J. Kotlan ◽  
R. Musalek ◽  
...  
Keyword(s):  
Heat Flux ◽  
Flow Rate ◽  
Emission Spectroscopy ◽  
Plasma Torch ◽  
Plasma Jet ◽  
Low Flow ◽  
Suspension Spraying ◽  
Arc Power ◽  
Enthalpy Probe ◽  
Temperature Heat

A plasma torch with the water/argon stabilization of an arc is characterized by extremely hot and high velocity plasma together with the relatively low flow rate of plasma, therefore, the torch might be properly used for plasma suspension spraying. Enthalpy probe and emission spectroscopy measurements were carried out at constant arc power with the combination of the injection of water, ethanol or their mixture to the plasma jet to diagnose the changes in temperature, heat flux and other characteristics.

scholarly journals Emission Spectroscopy of OH Radical in Water-Argon Arc Plasma Jet

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Alan Mašláni ◽  
Viktor Sember
Keyword(s):  
Central Region ◽  
Emission Spectroscopy ◽  
Plasma Torch ◽  
Emission Spectra ◽  
Plasma Jet ◽  
Line Of Sight ◽  
Thermal Processes ◽  
Oh Radical ◽  
Arc Plasma ◽  
Large Area

Emission spectra of OH radical are studied in the plasma jet generated by a plasma torch with hybrid water-argon stabilization. Plasma jet is located in a chamber with pressures 4 kPa and 10 kPa. In spite of high temperatures of produced plasma, OH spectra are observed in a large area of the jet. OH spectra are used to obtain rotational temperatures from the Boltzmann plots of resolved rotational lines. Due to line-of-sight integration of radiation, interpretation of the temperatures is not straightforward. It seems that excited OH molecules can be formed by various mechanisms, mainly in the outer parts of the jet, where thermal processes are not as dominant as in the hot central region.

Effect of arc power and gas flow rate on properties of plasma jet under reduced pressures

2004 ◽  
Vol 54 (S3) ◽  
pp. C753-C758 ◽  
Author(s):  
T. Kavka ◽  
J. Gregor ◽  
O. Chumak ◽  
M. Hrabovsky
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Plasma Jet ◽  
Gas Flow Rate ◽  
Arc Power ◽  
Reduced Pressures

Characterization of the Expanded Plasma Jet Generated at Reduced Chamber Pressure

2014 ◽  
Vol 644-650 ◽  
pp. 4892-4895
Author(s):  
De Ming Yang ◽  
Bo Han Tian
Keyword(s):  
Gas Flow ◽  
Hydrogen Plasma ◽  
Plasma Jet ◽  
Columnar Structure ◽  
Chamber Pressure ◽  
Gas Flow Rate ◽  
Arc Power ◽  
Enthalpy Probe ◽  
Low Pressure Plasma Spraying

Very low pressure plasma spraying has been attracted attention due to special properties of the expanded plasma jet which may probably deposit specific and unique structure coatings, such as columnar structure coatings. The forming of the coatings is affected by plasma generating and working conditions. These operating parameters such as arc power, plasma gas flow rate, and chamber pressure have influences on pressure, enthalpy and temperature of plasma jet. In this work, an enthalpy probe is applied to measure the enthalpy of argon-hydrogen plasma jet generated at chamber pressure of 3000 Pa and 50Pa. The results showed that the temperature of plasma jet reached to 11000 K at 25 mm from nozzle exit, and then dropped slowly to 7000 K at 400 mm.

Diagnostics and Applications of an Innovative Plasma Torch Generating a Broad Plasma Jet

2000 ◽  
Author(s):  
R. Hartmann ◽  
K.D. Landes
Keyword(s):  
Plasma Torch ◽  
Large Scale ◽  
Circular Cross Section ◽  
Plasma Jet ◽  
Dc Plasma ◽  
Plastic Materials ◽  
Plasma State ◽  
Enthalpy Probe ◽  
Variable Distance ◽  
Reactive Gas

Abstract Conventional DC plasma torch designs lead to a circular cross-section of the emanating plasma jet. Consequently in surface treatment applications the plasma jet hits the substrate within a limited circular working area. Large scale workpieces therefore have to be scanned resulting in a time-consuming procedure. The innovative DC plasma torch system LARGE is characterized by the arrangement of the anode and the cathode opposite to each other on a common axis with a variable distance. The central body of the torch between the electrodes is divided into electrically insulated cascade plates. The plasma gas is injected perpendicular to the torch axis. Passing through the arc, the gas is transferred to the plasma state and leaves the torch laterally through a slit as a plasma jet with extended stripe width. The plasma torch LARGE is investigated by electrical, optical and enthalpy probe diagnostics. Shrouding the electrodes with an inert gas and feeding reactive gas mixtures as main plasma gas allow the torch to be used for plasma chemical reactions, too. Preliminary applications focus on preheating, surface modification of paper and plastic materials as well as on sterilization of nutrition packaging. The capability of plasma enhanced CVD is examined experimentally.

MOTION OF ANODE ATTACHMENT AND FLUCTUATIONS OF PLASMA JET IN DC ARC PLASMA TORCH

1997 ◽  
Vol 1 (2) ◽  
pp. 167-178 ◽  
Author(s):  
Milan Hrabovsky ◽  
M. Konrad ◽  
Vladimir Kopecky ◽  
J. Hlina ◽  
J. Benes ◽  
...  
Keyword(s):  
Plasma Torch ◽  
Plasma Jet ◽  
Arc Plasma ◽  
Arc Plasma Torch ◽  
Dc Arc ◽  
Dc Arc Plasma Torch
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