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RESEARCH PAPERS: Featured Section—Heat Transfer in Manufacturing

Thermal Transport and Flow in High-Speed Optical Fiber Drawing

[+] Author and Article Information
Zhilong Yin, Y. Jaluria

Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, New Brunswick, NJ 08903

J. Heat Transfer 120(4), 916-930 (Nov 01, 1998) (15 pages) doi:10.1115/1.2825911 History: Received March 03, 1998; Revised September 01, 1998; Online December 05, 2007

Abstract

The thermal transport associated with optical fiber drawing at relatively high drawing speeds, ranging up to around 15 m/s, has been numerically investigated. A conjugate problem involving the glass and the purge gas regions is solved. The transport in the preform/fiber is coupled, through the boundary conditions, with that in the purge gas, which is used to provide an inert environment in the furnace. The zonal method, which models radiative transport between finite zones in a participating medium, has been employed to compute the radiative heat transfer in the glass. The flow of glass due to the drawing process is modeled with a prescribed free-surface neck-down profile. The numerical results are compared with the few that are available in the literature. The effects of important physical variables such as draw speed, purge gas velocity and properties, furnace temperature, and preform diameter on the flow and the thermal field are investigated. It is found that the fiber drawing speed, the furnace temperature, and the preform diameter have significant effects on the temperature field in the preform/fiber, while the effects of the purge gas velocity and properties are relatively minor. The overall heating of the preform/fiber is largely due to radiative transport in the furnace and the changes needed in the furnace temperature distribution in order to heat the glass to its softening point at high speeds are determined.

Copyright © 1998 by The American Society of Mechanical Engineers
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