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21 October 1994 Heat transfer in the heating region of the optical fiber drawing process
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The use and applications of optical fibers have been increased dramatically over the years. A need to improve the quality and increase the yield of optical fibers and optical multifiber systems leads to studies related to the manufacturing process of optical fibers. This paper presents a combination of analytical and numerical work on the thermal analysis of the heating region. During the process various phenomena occur in the heating region: As the glass rod is pulled downward, it stretches and a neckdown shape is formed at its lower end. This stretching affects the air flow patterns in the furnace as well as the heat transfer in the glass and its surroundings. The preform is heated radially by a radiative heater. The radiation effects were taken into consideration. Axial and radial heat conduction, and convective heat transfer from the surface of the preform were also accounted for. A coupled form of the boundary layer equations combined with the conduction equation in the glass was solved considering the above phenomena. The temperature distribution in the glass for various drawing conditions was calculated. The flow patterns in the glass were observed and a sample study of the air flow in the furnace is presented. Also, the shape of the glass preform was evaluated for various drawing parameters.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Haris Papamichael and Ioannis N. Miaoulis "Heat transfer in the heating region of the optical fiber drawing process", Proc. SPIE 2287, Properties and Characteristics of Optical Glass III, (21 October 1994);

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