Numerical model of a laser-sustained argon plasma

R. Akarapu, Abdalla Ramadan Nassar, S. M. Copley, Judith Todd Copley

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A steady state axi-symmetric model was developed to predict the size, shape and temperature of a laser-sustained plasma in flowing argon. The power of the carbon dioxide (CO2) laser and the free stream gas velocity were inputs to the model. An algorithm, which is an alternative to the ray tracing method, was used to calculate the laser power absorbed by the plasma. Temperature dependent thermal conductivity, specific heat, and viscosity values taken from the literature were used. The finite volume method, along with the SIMPLE algorithm was used to discretize and solve the three governing equations: conservation of mass, momentum, and energy. The effects of the flow velocity, laser power, and the beam mode on the laser sustained plasma were studied and agree well with published experimental data in the literature for argon flow velocities in the range of 4-10 m/s and with experiments conducted using a flow velocity of 5.5 m/s. At low flow velocities (<2 m/s), the model over-predicts absorption of the laser beam. This can be attributed to the absence of refraction in the model, which becomes significant as the LSP moves further upstream, toward the laser. The simulations indicated that the laser beam mode had a significant effect on the size, shape, and absorption of the plasma.

Original languageEnglish (US)
Pages (from-to)169-175
Number of pages7
JournalJournal of Laser Applications
Volume21
Issue number4
DOIs
StatePublished - Dec 1 2009

Fingerprint

Argon lasers
argon plasma
Numerical models
Flow velocity
Plasmas
flow velocity
Lasers
Argon
lasers
Laser modes
Laser beams
argon
laser beams
Carbon dioxide lasers
carbon dioxide lasers
conservation equations
finite volume method
free flow
Finite volume method
Ray tracing

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Instrumentation

Cite this

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abstract = "A steady state axi-symmetric model was developed to predict the size, shape and temperature of a laser-sustained plasma in flowing argon. The power of the carbon dioxide (CO2) laser and the free stream gas velocity were inputs to the model. An algorithm, which is an alternative to the ray tracing method, was used to calculate the laser power absorbed by the plasma. Temperature dependent thermal conductivity, specific heat, and viscosity values taken from the literature were used. The finite volume method, along with the SIMPLE algorithm was used to discretize and solve the three governing equations: conservation of mass, momentum, and energy. The effects of the flow velocity, laser power, and the beam mode on the laser sustained plasma were studied and agree well with published experimental data in the literature for argon flow velocities in the range of 4-10 m/s and with experiments conducted using a flow velocity of 5.5 m/s. At low flow velocities (<2 m/s), the model over-predicts absorption of the laser beam. This can be attributed to the absence of refraction in the model, which becomes significant as the LSP moves further upstream, toward the laser. The simulations indicated that the laser beam mode had a significant effect on the size, shape, and absorption of the plasma.",
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Numerical model of a laser-sustained argon plasma. / Akarapu, R.; Nassar, Abdalla Ramadan; Copley, S. M.; Todd Copley, Judith.

In: Journal of Laser Applications, Vol. 21, No. 4, 01.12.2009, p. 169-175.

Research output: Contribution to journalArticle

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