Asymptotic solutions of glass temperature profiles during steady optical fibre drawing

M. Taroni, C. J.W. Breward, L. J. Cummings, I. M. Griffiths

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

In this paper we derive realistic simplified models for the high-speed drawing of glass optical fibres via the downdraw method that capture the fluid dynamics and heat transport in the fibre via conduction, convection and radiative heating. We exploit the small aspect ratio of the fibre and the relative orders of magnitude of the dimensionless parameters that characterize the heat transfer to reduce the problem to one- or two-dimensional systems via asymptotic analysis. The resulting equations may be readily solved numerically and in many cases admit exact analytic solutions. The systematic asymptotic breakdown presented is used to elucidate the relative importance of furnace temperature profile, convection, surface radiation and conduction in each portion of the furnace and the role of each in controlling the glass temperature. The models derived predict many of the qualitative features observed in real industrial processes, such as the glass temperature profile within the furnace and the sharp transition in fibre thickness. The models thus offer a desirable route to quick scenario testing, providing valuable practical information about the dependencies of the solution on the parameters and the dominant heat-transport mechanism.

Original languageEnglish (US)
Pages (from-to)1-20
Number of pages20
JournalJournal of Engineering Mathematics
Volume80
Issue number1
DOIs
StatePublished - Jun 2013

All Science Journal Classification (ASJC) codes

  • Mathematics(all)
  • Engineering(all)

Keywords

  • Asymptotic analysis
  • Extensional flow
  • Heat transfer
  • Optical fibre drawing
  • Slow viscous flow

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