Chemical Non-equilibrium Simulation of Anode Attachment of an Argon Transferred Arc

Plasma Chemistry and Plasma Processing - The diffuse and constricted arc attachment modes to the anode of an argon wall-stabilized transferred arc are investigated using a 2D chemical...     

Influence of Groove on Metal Vapour Behavior and Arc Characteristics in TIG Welding of High Manganese Stainless Steels

Plasma Chemistry and Plasma Processing - In arc welding, a groove is often used between metal pieces being welded. In tungsten inert gas welding of high-manganese stainless steels with arc voltage...     

On the Possibilities of Straightforward Characterization of Plasma Activated Water

Plasma Chemistry and Plasma Processing - Plasma activated deionized water from a hot arc 150 W PAW synthesizer has been analyzed for nitrite, nitrate and peroxide densities. Observed nitrite and...     

Specific Role of Reactor Configurations on the Mass Transfer and Energy Yield: Case of “Batch” and "Circulating” Gliding arc Liquid–Gas Reactors—Part 1: Experimental Study

Plasma Chemistry and Plasma Processing - The mass transfer and energy efficiency in the “batch” and “Circulating” gliding arc configuration reactors for the direct...     

Generation of Long Laminar Plasma Jets: Experimental and Numerical Analyses

Plasma Chemistry and Plasma Processing - A novel direct current non-transferred arc plasma torch that can generate silent, stable and super-long laminar plasma jets in atmospheric air is...     

An Experimental Investigation of Cathode Spot Motion in a Magnetically Rotating Arc Plasma Generator at Atmospheric Pressure

Plasma Chemistry and Plasma Processing - Cathode spots present complex forms in magnetically rotating arc plasma generators due to the coupling effect of the plasma flow and electromagnetic fields....     

Two-Temperature Chemical Non-equilibrium Modeling of Argon DC Arc Plasma Torch

Plasma Chemistry and Plasma Processing - A 2D two-temperature chemical non-equilibrium model has been developed to investigate the plasma characteristics inside a DC arc plasma torch of argon. In...     

N2/H2 Non-thermal Transferred arc Plasma Nitriding Treatment of Stainless Steel at Atmospheric Pressure

Plasma Chemistry and Plasma Processing - In the paper, a novel metal surface nitriding method is presented by using an atmospheric pressure non-thermal transferred arc plasma technique. In the...     

Evaluation of Energy Balance in a Batch and Circulating Non-thermal Plasma Reactors During Organic Pollutant Oxidation in Aqueous Solution

Plasma Chemistry and Plasma Processing - This work presents the treatment of an organic waste solution using gliding arc plasma in moist air, which is an excellent source of oxidizing species....     

Evaluation of Oxidative Species in Gaseous and Liquid Phase Generated by Mini-Gliding Arc Discharge

Plasma Chemistry and Plasma Processing - The gliding arc discharge plasma reactors are known as a source of non-equilibrium plasma at atmospheric pressure. In the present study, generation of...     

Development of a Submerged Thermal Plasma Process for Combustion of Organic Liquid Waste

Plasma Chemistry and Plasma Processing - A process for the destruction of organic liquid waste has been developed in which a nontransferred arc plasma torch is operated with oxygen as the plasma...     

Characterization of Reversed Arc Hydrocarbon Plasma in Material Processing

Plasma Chemistry and Plasma Processing - A comprehensive study of the reversed arc plasma enhanced CVD (RACVD) reactor utilizing an Ar?+?H2?+?CH4 plasma-creating mixture in...     

Three-Dimensional Non-equilibrium Modeling on the Characteristics of the Dual-Jet Direct-Current Arc Plasmas

Plasma Chemistry and Plasma Processing - In this paper, the three-dimensional (3-D) two-temperature modeling on the characteristics of the dual-jet DC arc argon plasmas under different plasma...     

Experimental Observations of Constricted and Diffuse Anode Attachment in a Magnetically Rotating Arc at Atmospheric Pressure

Plasma Chemistry and Plasma Processing - At atmospheric pressure, the anode attachment can appear in two different modes: constricted and diffuse. In this paper, a magnetically rotating arc plasma...     

Numerical Study of DC Argon Arc with Axial Magnetic Fields

Plasma Chemistry and Plasma Processing - Numerical simulation of an atmospheric DC arc under an axial magnetic field (AMF) is performed with a model of unifying the plasma and electrodes. In the...     

Optical Radiation Associated with Photobiological Hazards for Argon GTAW Arcs

Plasma Chemistry and Plasma Processing - Gas tungsten arc welding (GTAW), a widely used industrial process, is one of the most intense artificial sources of optical radiation. This paper presents a...     

MHD Modeling of the Tip-to-Plane Plasma Arc Behaviour at Very High Pressure in CF4

Plasma Chemistry and Plasma Processing - In this paper, the behaviour of a tetrafluoromethane (CF4) plasma arc under conditions of low current (0.25–0.4 A) and very high pressure (10...     

Effects of Buffer Gases on Plasma Properties and Arc Decaying Characteristics of C4F7N–N2 and C4F7N–CO2 Arc Plasmas

Plasma Chemistry and Plasma Processing - C4F7N is one of the most promising candidate to replace SF6 as arc quenching medium. Some buffer gases (N2 and CO2) are usually mixed with C4F7N to reduce...     

Laser ablation and arc/spark solid sample introduction into inductively coupled plasma mass spectrometers

Sample introduction using laser ablation and arc and spark ablation is reviewed. Few references were found in the literature on the use of spark or arc ablation as a sample introduction technique into the ICP-MS and emphasis is therefore placed on the use of laser ablation sampling, particularly for Inductively Coupled Plasma Mass Spectrometry (ICP-MS) detection; however, many of the principles can also be applied to optical emission detection. The applications of the techniques are described, with particular emphasis on micro-sampling of geological materials.     

Generation of Long, Laminar Plasma Jets at Atmospheric Pressure and Effects of Flow Turbulence

Long, laminar plasma jets at atmospheric pressure of pure argon and a mixture of argon and nitrogen with jet length up to 45 times its diameter could be generated with a DC arc torch by restricting the movement of arc root in the torch channel. Effects of torch structure, gas feeding, and characteristics of power supply on the length of plasma jets were experimentally examined. Plasma jets of considerable length and excellent stability could be obtained by regulating the generating parameters, including arc channel geometry, gas flow rate, and feeding methods, etc. Influence of flow turbulence at the torch nozzle exit on the temperature distribution of plasma jets was numerically simulated. The analysis indicated that laminar flow plasma with very low initial turbulent kinetic energy will produce a long jet with low axial temperature gradient. This kind of long laminar plasma jet could greatly improve the controllability for materials processing, compared with a short turbulent arc jet.