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Numerical Modeling of CO2 Laser-Heated Moving Glass Rods

[+] Author Affiliations
Weixue Tian, Wilson K. S. Chiu

University of Connecticut, Storrs, CT

Paper No. IMECE2002-33082, pp. 25-32; 8 pages
doi:10.1115/IMECE2002-33082
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 5
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3636-3 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

A numerical model is introduced to calculate the temperature field in moving glass rods heated by CO2 laser irradiation at a wavelength of 10.6 μm. The glass is assumed to be opaque to laser irradiation due to its high absorption coefficient at 10.6 μm. The dependence of the absorption coefficient on wavelength and temperature is considered in this model. The diffusion approximation is incorporated to analyze the radiation heat transfer in the glass rod. This approximation is valid when the glass rod is above a critical diameter. The temperature within the glass is solved using the finite volume method. The effect of laser power, laser focus, the moving speed and the radius of glass rod on the temperature distribution are studied. It is found that all these parameters have a significant effect on the temperature distribution in the glass rod. Results of simulation show that, with careful choice of these parameters, a CO2 laser may be used as a heat source for glass rod annealing or coating with stringent temperature constraints.

Copyright © 2002 by ASME

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