NDLI: Three-Dimensional, Time-Dependent Model of DC Plasma Torches

Content Provider	IEEE Xplore Digital Library
Author	Vardelle, A.
Copyright Year	2005
Description	Author affiliation: University of Limoges, ENSIL, France (Vardelle, A.)
Abstract	Summary form only given. A key aspect of the behavior of non-transferred DC arc plasma torch is the stochastic aspect of arc formation inside the nozzle. This phenomenon results in instabilities in the jet flow that are enhanced by the turbulent mixing with the ambient gas when the plasma jet issues in the quiescent surrounding gas. In addition, the wear of electrodes contributes to make the flow time-dependent. The main applications of such plasma torches include synthesis of advanced materials, recycling or destruction of hazardous waste materials, production of hydrogen gas from biomass, metallurgy and plasma spraying. The latter is a well-established method for manufacturing protective coatings and free-standing shapes of a wide range of alloys and ceramics. However, the fluctuations of arc voltage and thermal energy input resulting from the continuous movement of the anode arc root introduce an undesirable element in the spray process as it affects the acceleration and heating of the particles injected in the gas flow. A reliable model that predicts the dynamic behavior of the arc in terms of system geometry and process parameters can help to supply an insight into the time-performance of the process and optimize the spraying conditions. This model must involve the interaction between electric, magnetic, fluid dynamics and thermal phenomena. It is still a topical and challenging subject that has received a renewed attention during the last years. This talk addresses the modeling of the time-dependent conversion from electrical to thermal energy in the plasma-forming gas and of the resulting fluctuating plasma jet flowing in air. The 3-D transient model of the arc column and its attachment on the anode wall is based on the simultaneous solutions of the conservation equations of mass, momentum, energy and current and the electromagnetism equations. It makes it possible to predict the motion of the anode attachment root on the anode surface as well as the heat loa
Sponsorship	Plasma Sci. Appl. Comm. IEEE Nucl. Plasma Sci. Soc.
Starting Page	86
Ending Page	90
File Size	101023
Page Count	5
File Format	PDF
ISBN	0780393007
ISSN	07309244
DOI	10.1109/PLASMA.2005.359031
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laboratories Physics Cities and towns Probes Microwave generation Microwave technology Cathodes Wire Plasma density Educational institutions
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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