Plasma Chemistry and Plasma Processing

, Volume 38, Issue 4, pp 759–770 | Cite as

Influence of the Shroud Gas Injection Configuration on the Characteristics of a DC Non-transferred Arc Plasma Torch

  • Yugesh Vadikkeettil 
  • Ravi Ganesh 
  • Ramachandran Kandasamy 
  • Vidhi Goyal 
  • Kailsha Chandra Meher
Original Paper


The characteristics of the plasma jet emanating from a dc non-transferred plasma torch is affected by many factors including arc current, type of gas, gas flow rate, gas injection configuration and torch geometry. The present work focuses on experimental investigation of the influence of shroud gas injection configuration on the I–V characteristics and electro-thermal efficiency of a dc non-transferred plasma torch operated in nitrogen at atmospheric pressure. The plasma gas is injected into the torch axially and shroud gas is injected through three different nozzles such as normal, sheath and twisted nozzles. The effects of flow rates of plasma/axial gas and arc current on I–V characteristics and electro-thermal efficiency of the torch holding different nozzles are investigated. The I–V characteristics and electro-thermal efficiency of the torch are found to be strongly influenced by the shroud gas injection configuration. The effect of arc current on arc voltage decreases with increasing the axial gas flow rate. At higher axial gas flow rate (> 45 lpm), the I–V characteristics of the plasma torch are similar irrespective of the nozzle used. The variation of electro-thermal efficiency with arc current is almost similar to that of arc voltage with arc current. As expected, the electro-thermal efficiency is increased when the axial gas flow rate is increased and at higher axial gas flow rate, it is not influenced by the arc current and shroud gas configuration. The plasma torch with normal nozzle may be better in the range of operating conditions used in this study.


I–V characteristics Plasma torch DC non-transferred arc Shroud gas injection Electro-thermal efficiency 


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Yugesh Vadikkeettil 
    • 1
  • Ravi Ganesh 
    • 2
    • 3
  • Ramachandran Kandasamy 
    • 4
  • Vidhi Goyal 
    • 2
    • 3
  • Kailsha Chandra Meher
    • 2
  1. 1.Karunya UniversityCoimbatoreIndia
  2. 2.Institute for Plasma ResearchBhat, GandhinagarIndia
  3. 3.Homi Bhabha National InstituteAnushaktinagar, MumbaiIndia
  4. 4.Bharathiar UniversityCoimbatoreIndia

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