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Research Papers: Heat Transfer in Manufacturing

Transport Processes Governing the Drawing of a Hollow Optical Fiber

[+] Author and Article Information
Jing Yang, Yogesh Jaluria

Department of Mechanical and Aerospace Engineering, Rutgers, State University of New Jersey, 98 Brett Road, Piscataway, NJ 08854

J. Heat Transfer 131(7), 072102 (May 12, 2009) (9 pages) doi:10.1115/1.3090809 History: Received June 03, 2008; Revised October 28, 2008; Published May 12, 2009

This paper presents a mathematical model to simulate the silica hollow optical fiber-drawing process. Two neck-down profiles, which represent the inner and outer surfaces of the hollow fiber, are generated by using an iterative numerical scheme. The zonal method is applied to calculate the radiative transport within the glass. The effects of variable properties for air are investigated and results indicate that these can be neglected for simulating the draw process under typical draw conditions. Inclusion of buoyancy in the flow is also studied and it is found that the flow can be significantly affected due to buoyancy. The validation of the model is carried out by comparing the results with those obtained by using the optical thick method as well as those for a solid-core fiber. The effects of drawing parameters such as the temperature of the furnace, feeding speed, and drawing speed on the temperature and velocity distributions and on the draw tension are studied. It is found that the geometry and qualities of the final hollow optical fiber are highly dependent on the drawing parameters, especially the drawing temperature and the feeding speed.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the hollow fiber-drawing process

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Figure 2

Schematic for the zonal method

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Figure 6

Temperature distributions along the axis for cases with constant properties, variable properties, and with buoyancy effects included

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Figure 7

Neck-down profiles for cases with constant properties, variable properties, and with buoyancy effects included

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Figure 8

Temperature distributions at the outer surface computed by using the zonal method and the optically thick method

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Figure 9

Heat flux along the outer surface computed by using the zonal method and the optically thick method

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Figure 10

Neck-down profiles for the hollow fiber drawing generated by using the zonal method and the optically thick method

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Figure 11

Variation of the collapse ratio with the drawing temperature for different drawing speeds

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Figure 12

Variation of the draw tension with the drawing temperature for different drawing speeds

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Figure 13

Variation of the draw tension with the feeding speed

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Figure 14

Variation of the draw tension with the preform radius ratio

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Figure 3

Furnace temperature profile

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Figure 4

Streamlines and isotherms for a typical case without buoyancy effects

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Figure 5

Streamlines and isotherms for a typical case with buoyancy effects included

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