NDLI: Understanding plasma fluid dynamics inside plasma torches through advanced modeling

Content Provider	IEEE Xplore Digital Library
Author	Colombo, V. Concetti, A. Ghedini, E. Dallavalle, S. Vancini, M.
Copyright Year	2007
Description	Author affiliation: Department of Mechanical Engineering (D.I.E.M.) and Research Center for Applied Mathematics (C.I.R.A.M.), Università di Bologna, Via Saragozza 8, 40123, Italy (Colombo, V.; Concetti, A.; Ghedini, E.) \|\| Cebora S.p.A., Via Andrea Costa 24, 40057 Cadriano di Granarolo, Italy (Dallavalle, S.; Vancini, M.)
Abstract	The aim of this work is to investigate by means of a 2-D and 3-D FLUENT© based numerical model the behaviour of different types of transferred arc dual gas plasma torches used for cutting of metallic materials, putting into evidence the physical reasons for the industrial success of various design and process solutions appeared over the last years, such as: secondary gas swirl injections with different directions, various different approaches for the geometry of the plasma chamber, the effect of externally superimposed magnetic fields. Flow and heat transfer equations are solved with coupled electromagnetic ones, for a LTE optically thin plasma, while turbulence phenomena are taken into account by means of a k-ε RNG model. Simulations include a prediction of the thermal behaviour of the solid components of the torch head, including electrode and hafnium insert, thermal histories and trajectories of hafnium oxide particles emitted from it under idealized conditions and the efficiency of nozzle and electrode cooling systems in various operating conditions including gas mixtures (O/air, H35/N, N). Radiation is included in the calculation of heat transfer to the surfaces of the components using a customized Discrete Ordinate (DO) model. Results obtained from the simulations of one of the plasma torches here considered are also compared with experimental measurements in order to perform a validation of the model for what concerns pressure values in different regions of the device, and the gas mass flow rate during the working phase. For this purpose suitably modified plasma torches with measurement systems have been designed and used during realistic cutting conditions.
Starting Page	1423
Ending Page	1428
File Size	1302663
Page Count	6
File Format	PDF
ISBN	9781424409136
DOI	10.1109/PPPS.2007.4652454
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasmas Mathematical model Patents Numerical simulation Equations Electrodes Orifices
Content Type	Text
Resource Type	Article

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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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