NDLI: Shroud gas effects on plasma characteristics of thermal plasma jets at atmospheric conditions

Content Provider	IEEE Xplore Digital Library
Author	Kang, K.D. Choi, B.L. Hong, S.H.
Copyright Year	1996
Description	Author affiliation: Dept. of Nucl. Eng., Seoul Nat. Univ., South Korea (Kang, K.D.)
Abstract	Summary form only given. High-enthalpy and high-speed plasma flames ejected from nontransferred dc plasma torches have been widely used for material processings such as plasma spray coating and plasma synthesis. The plasma flow is produced by the arc-gas interactions between the cathode and anode inside the torch and expands as a jet through the nozzle into the air in the case of atmospheric conditions. The entrainment of surrounding air into the plasma flame, which reduces the quality of materials processed, is undesirable for the efficient material processings. This can be avoided by generating the plasma jets in the low pressure environment or by flowing the shroud gas around the jet flame. The torch operation with the shroud gas is simpler and more economic than the case of low pressure environment. In this work, shroud gas effects on the plasma how at atmospheric conditions are investigated by a numerical analysis for finding the mole fraction of entrained air and the distributions of temperature and velocity components of plasma jets. Typical assumption of a steady state, axisymmetry, local thermodynamic equilibrium and optically-thin plasma is adopted in a two-dimensional magnetohydrodynamic modeling of thermal plasma flow from the dc plasma torch. A control volume method and a modified SIMPLER (Semi-Implicit Method for Pressure Linked Equation Revised) algorithm are used for solving the governing equations, i.e., conservation equations for mass, momentum, energy, and mass fraction together with the standard k-/spl epsiv/ model for the flow turbulence.
File Size	133985
File Format	PDF
ISBN	0780333225
ISSN	07309244
DOI	10.1109/PLASMA.1996.550668
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasma properties Plasma materials processing Plasma temperature Thermal spraying Fires Equations Coatings Cathodes Anodes Power generation economics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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