The drawing speeds employed in the manufacturing of optical fibers have been rising in recent years due to growing worldwide demand. However, increasing speeds have placed stringent demands on the manufacturing process, mainly because of large temperature gradients that can generate thermally induced defects and undesirable variations in fiber characteristics. Heat transfer and glass flow that arise in drawing fibers of diameters 100–125 microns from cylindrical silica preforms of diameters 5–10 cm play a critical role in the success of the process and in the maintenance of fiber quality. This paper presents an analytical and numerical study of the optical fiber drawing process for relatively large diameter preforms and draw speeds as high as 20 m/s. The free surface, which defines the neck-down profile, is not assumed but is determined by using a balance of forces. An iterative numerical scheme is employed to obtain the profile under steady conditions. The transport in the glass is calculated to obtain the temperature, velocity and defect distributions. A zone radiation model, developed earlier, is used for calculating radiative transport within the glass. Because of the large reduction in the diameter of the preform/fiber, the velocity level increases dramatically and the geometry becomes complicated. A coordinate transformation is used to convert the computational domains to cylindrical ones. The numerical results are compared with experimental and numerical results in the literature for smaller draw speeds for validation. The effects of high draw speeds and of other physical variables on defects generated in the fiber, on the neck-down profile, and on the feasible domain for the process are determined. [S0022-1481(00)02302-1]
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Technical Papers
Neck Down and Thermally Induced Defects in High-Speed Optical Fiber Drawing
Z. Yin,
Z. Yin
Mechanical Engineering Department, Rutgers University, New Brunswick, NJ 08903
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Y. Jaluria, Fellow ASME
e-mail: jaluria@jove.rutgers.edu
Y. Jaluria, Fellow ASME
Mechanical Engineering Department, Rutgers University, New Brunswick, NJ 08903
Search for other works by this author on:
Z. Yin
Mechanical Engineering Department, Rutgers University, New Brunswick, NJ 08903
Y. Jaluria, Fellow ASME
Mechanical Engineering Department, Rutgers University, New Brunswick, NJ 08903
e-mail: jaluria@jove.rutgers.edu
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division, Feb. 28, 1999; revision received, Dec. 9, 1999. Associate Technical Editor: M. Modest.
J. Heat Transfer. May 2000, 122(2): 351-362 (12 pages)
Published Online: December 9, 1999
Article history
Received:
February 28, 1999
Revised:
December 9, 1999
Citation
Yin , Z., and Jaluria, Y. (December 9, 1999). "Neck Down and Thermally Induced Defects in High-Speed Optical Fiber Drawing ." ASME. J. Heat Transfer. May 2000; 122(2): 351–362. https://doi.org/10.1115/1.521488
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