NDLI: Physical and Mathematical Modeling of non Transferred Plasma Torches

Content Provider	Scientific Electronic Library Online (SciELO)
Author	Favalli, R. C. Szente, R. N.
Abstract	The main objective of this work is to obtain temperature and velocity profiles of the plasma jet, including the electric arc region, generated by non transferred plasma torches. The profiles are obtained from a numerical solution of the conservation equations wich were used to describe the plasma flow. This modelling approach will help the development and optimization of plasma torches, saving time and reducing costs of an alternative empirical development; it could also give some insight on the phenomena occuring inside the torch. Fluid mechanics models for laminar and turbulent flows were adopted to simulate the plasma inside and outside the torch. Patankar's control volume method was chosen to solve the resulting coupled differential equations. The method is very stable and requires less computational time than higher order methods, although it can be less accurate for some applications. A computer code was developed to simulate the jet flow of a plasma torch. The results obtained from this program compared very well with published ones, corroborating the assumptionsn of the present model and the numerical method. Temperature and velocity profiles for a plasma torch with dimentions and operating conditions similar to the ones used in indusrtial applications of spraying were generated and analyzed. The plasma torch simulated had an eletric arc of 100A, plasma gas flow rate of 20 l / min, cross section of 5.2 mm and anode length of 13mm.
Related Links	http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-97331998000100004&lng=en&nrm=iso http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97331998000100004&lng=en&nrm=iso
Starting Page	25
Ending Page	34
Page Count	10
File Format	PDF
ISSN	01039733
DOI	10.1590/S0103-97331998000100004
Journal	Brazilian Journal of Physics
Issue Number	1
Volume Number	28
Language	English
Publisher	Sociedade Brasileira de Física
Publisher Date	1998-03-01
Publisher Institution	Universidade de SãoUniversidade de SãoUniversidade de São
Publisher Place	Brazil
Access Restriction	Open
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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