TECHNICAL PAPERS: Heat Transfer in Manufacturing

Neck Down and Thermally Induced Defects in High-Speed Optical Fiber Drawing

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

Mechanical Engineering Department, Rutgers University, New Brunswick, NJ 08903

J. Heat Transfer 122(2), 351-362 (Dec 09, 1999) (12 pages) doi:10.1115/1.521488 History: Received February 28, 1999; Revised December 09, 1999
Copyright © 2000 by ASME
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Schematic diagram of the optical fiber drawing furnace with aiding purge gas, along with the coordinate system
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(a) Validation of the numerical predictions of the neck-down profile at vf=1 m/s and vf=3 m/s by comparing these with the experimental results of Paek and Runk 7; (b) comparison of the computed draw tension applied to the fiber with the corresponding experimental results obtained by Paek et al. 27
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Neck-down profiles generated using the optically thick approximation and the zonal method
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Dependence of different forces contributing to draw tension on the axial location z at which an imaginary cut in the preform/fiber is taken to calculate the tension
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Neck-down profiles generated using the zonal method for different drawing speeds
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Isotherms in the preform/fiber and the purge gas for different drawing speeds
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Nusselt number at the outside surface of preform/fiber for different fiber drawing speeds
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Variation of the concentration of E defects in the axial direction at the surface and at the centerline for different drawing speeds
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Neck-down profiles: (a) generated using the zonal method for two different furnace temperatures; (b) generated using the zonal method and optically thick approximation for TF(K)=3000−2000(0.5−z/L)2
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Isotherms in the preform/fiber and the gas with Argon and Helium as the purge gases
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Axial variation of the centerline temperature in the preform/fiber for two different diameter preforms
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Feasible drawing conditions in terms of the furnace wall temperature and fiber drawing speed




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