Abstract

This paper presents experimental results showing the effect various natural convection heating regimes have on the diameter of drawn polymer optical fiber. The airflow, adjacent to the polymer, can be either laminar, oscillatory, or chaotic, depending on the imposed thermal boundary conditions at the furnace and iris walls. When subject to oscillatory and chaotic natural convection, the drawn fiber varies in diameter 2.5 to 10 times more than that measured under laminar heating conditions. Particle image velocimetry shows that unsteady natural convection occurs with the interplay between two asymmetric counter-rotating convective cells. This represents a significant instability mechanism, one that has not been previously identified.

© 2003 Optical Society of America

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References

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  1. H.M. Reeve, A.M. Mescher, and A.F. Emery, "Investigation of polymer optical fiber drawing force and heat transfer." in Proceedings of 2003 ASME Summer Heat Transfer Conference, HT2003-47445 (to be published).
  2. H.F. Wolf, Handbook of fiber optics, (Garland STPM Press, 1979) Chap. 2.
  3. D.H. Smithgall, �??Application of optimization theory to the control of the optical fiber drawing process,�?? AT&T Tech. J. 58, 1425-1435 (1979).
  4. U.C. Paek and R.B. Runk, �??Physical behavior of the neck-down region during furnace drawing of silica fibers,�?? J. Appl. Phys. 49, 4417-4422 (1978).
    [CrossRef]
  5. S. Roy Choudhury, Y. Jaluria, and S.H.-K. Lee, �?? A computational method for generating the free surface neckdown profile for glass flow in optical fiber drawing,�?? Numer. Heat Tr. A-Appl. 35, 1-24 (1999).
    [CrossRef]
  6. F.T. Geyling, �??Basic fluid-dynamic considerations in the drawing of optical fibers,�?? AT&T Tech. J. 55, 1011-1056 (1976).
  7. F.T. Geyling and G.M. Homsey, �??Extensional instabilities of the glass fiber drawing process,�?? Glass Technol. 21, 95-102 (1980).
  8. V.N. Vasiljev and V.D. Naumchic, �??Analysis of the hydrodynamic stability of the glass fibre drawing process,�?? Glass Technol. 31, 240-244 (1990).
  9. J. Cao, �??Studies on the mechanism of draw resonance in melt spinning,�?? J. App. Polym. Sci. 42, 143-151 (1991).
    [CrossRef]
  10. S. Kase and T. Matsuo, �??studies on melt spinning. II: Steady-state and transient solutions of fundamental equations compared with experimental results,�?? J. App. Polym. Sci. 11, 251-287 (1967
    [CrossRef]
  11. D.G. Young and M.M. Denn, �??Disturbance propagation in melt spinning,�?? Chem. Eng. Sci. 44, 1807-1818 (1989).
    [CrossRef]
  12. V.N. Vasil'ev, G.N. Dul'nev, and V.D. Naumchik, �??Investigation of nonstationary conditions of optical fiber formation. III. Drawing process reaction under thermal actions and perturbations of the blank radius,�?? J. Eng. Phys. 58, 370-375 (1990)
    [CrossRef]
  13. M.G. Forest and H. Zhou, "Unsteady analyses of thermal glass fiber drawing processes," Eur. J. Appl. Math. 12, 479-496 (2001).
    [CrossRef]
  14. H. Papamichael, C. Pellon, and I.N. Miaoulis, "Air flow patterns in the optical fibre drawing furnace," Glass Technol. 38, 22-29 (1997).
  15. I.G. Choi and S.A. Korpela, �??Stability of the conduction regime of natural convection in a tall vertical annulus,�?? J. Fluid Mech. 99, 725-738 (1980).
    [CrossRef]
  16. P. Le Quéré and J. Pécheux, 1989, �??Numerical simulations of multiple flow transitions in axisymmetric annulus convection,�?? J. Fluid Mech. 206, 517-544 (1989).
    [CrossRef]
  17. J. Pécheux, P. Le Quéré, and F. Abcha, �??Curvature effects on axisymmetric instability of conduction regime in a tall air-filled annulus,�?? Phys. Fluids 6, 3247-3255 (1994).
    [CrossRef]
  18. G.B. McFadden, S.R. Croiell, R.F. Boisvert, and M.E. Glicksman, �??Asymmetric instabilities in buoyancydriven flow in a tall vertical annulus,�?? Phys. Fluids 27, 1359-1361 (1984)
    [CrossRef]
  19. H.M. Reeve, A.M. Mescher, and A.F. Emery, �??Experimental and numerical investigation of polymer perform heating,�?? J. Mater. Process. Manu. 9, 285-301 (2001).
    [CrossRef]
  20. A. Melling, �??Tracer particles and seeding for particle image velocimetry,�?? Meas. Sci. Tech. 8, 1406-1416 (1997).
    [CrossRef]
  21. H.M. Reeve, A.M. Mescher, and A.F. Emery, �??Unsteady natural convection of air in a tall axi-symmetric nonisothermal annulus,�?? Numer. Heat Tr. A-Appl. (submitted for publication).

AT&T Tech. J. (2)

D.H. Smithgall, �??Application of optimization theory to the control of the optical fiber drawing process,�?? AT&T Tech. J. 58, 1425-1435 (1979).

F.T. Geyling, �??Basic fluid-dynamic considerations in the drawing of optical fibers,�?? AT&T Tech. J. 55, 1011-1056 (1976).

Chem. Eng. Sci. (1)

D.G. Young and M.M. Denn, �??Disturbance propagation in melt spinning,�?? Chem. Eng. Sci. 44, 1807-1818 (1989).
[CrossRef]

Eur. J. Appl. Math. (1)

M.G. Forest and H. Zhou, "Unsteady analyses of thermal glass fiber drawing processes," Eur. J. Appl. Math. 12, 479-496 (2001).
[CrossRef]

Glass Technol. (3)

H. Papamichael, C. Pellon, and I.N. Miaoulis, "Air flow patterns in the optical fibre drawing furnace," Glass Technol. 38, 22-29 (1997).

F.T. Geyling and G.M. Homsey, �??Extensional instabilities of the glass fiber drawing process,�?? Glass Technol. 21, 95-102 (1980).

V.N. Vasiljev and V.D. Naumchic, �??Analysis of the hydrodynamic stability of the glass fibre drawing process,�?? Glass Technol. 31, 240-244 (1990).

J. App. Polym. Sci. (2)

J. Cao, �??Studies on the mechanism of draw resonance in melt spinning,�?? J. App. Polym. Sci. 42, 143-151 (1991).
[CrossRef]

S. Kase and T. Matsuo, �??studies on melt spinning. II: Steady-state and transient solutions of fundamental equations compared with experimental results,�?? J. App. Polym. Sci. 11, 251-287 (1967
[CrossRef]

J. Appl. Phys. (1)

U.C. Paek and R.B. Runk, �??Physical behavior of the neck-down region during furnace drawing of silica fibers,�?? J. Appl. Phys. 49, 4417-4422 (1978).
[CrossRef]

J. Eng. Phys. (1)

V.N. Vasil'ev, G.N. Dul'nev, and V.D. Naumchik, �??Investigation of nonstationary conditions of optical fiber formation. III. Drawing process reaction under thermal actions and perturbations of the blank radius,�?? J. Eng. Phys. 58, 370-375 (1990)
[CrossRef]

J. Fluid Mech. (2)

I.G. Choi and S.A. Korpela, �??Stability of the conduction regime of natural convection in a tall vertical annulus,�?? J. Fluid Mech. 99, 725-738 (1980).
[CrossRef]

P. Le Quéré and J. Pécheux, 1989, �??Numerical simulations of multiple flow transitions in axisymmetric annulus convection,�?? J. Fluid Mech. 206, 517-544 (1989).
[CrossRef]

J. Mater. Process. Manu. (1)

H.M. Reeve, A.M. Mescher, and A.F. Emery, �??Experimental and numerical investigation of polymer perform heating,�?? J. Mater. Process. Manu. 9, 285-301 (2001).
[CrossRef]

Meas. Sci. Tech. (1)

A. Melling, �??Tracer particles and seeding for particle image velocimetry,�?? Meas. Sci. Tech. 8, 1406-1416 (1997).
[CrossRef]

Numer. Heat Tr. A-Appl. (2)

H.M. Reeve, A.M. Mescher, and A.F. Emery, �??Unsteady natural convection of air in a tall axi-symmetric nonisothermal annulus,�?? Numer. Heat Tr. A-Appl. (submitted for publication).

S. Roy Choudhury, Y. Jaluria, and S.H.-K. Lee, �?? A computational method for generating the free surface neckdown profile for glass flow in optical fiber drawing,�?? Numer. Heat Tr. A-Appl. 35, 1-24 (1999).
[CrossRef]

Phys. Fluids (2)

J. Pécheux, P. Le Quéré, and F. Abcha, �??Curvature effects on axisymmetric instability of conduction regime in a tall air-filled annulus,�?? Phys. Fluids 6, 3247-3255 (1994).
[CrossRef]

G.B. McFadden, S.R. Croiell, R.F. Boisvert, and M.E. Glicksman, �??Asymmetric instabilities in buoyancydriven flow in a tall vertical annulus,�?? Phys. Fluids 27, 1359-1361 (1984)
[CrossRef]

Other (2)

H.M. Reeve, A.M. Mescher, and A.F. Emery, "Investigation of polymer optical fiber drawing force and heat transfer." in Proceedings of 2003 ASME Summer Heat Transfer Conference, HT2003-47445 (to be published).

H.F. Wolf, Handbook of fiber optics, (Garland STPM Press, 1979) Chap. 2.

Supplementary Material (2)

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Figures (9)

Fig. 1.
Fig. 1.

The polymer optical fiber draw furnace. Thermocouple locations are marked with ‘x’.

Fig. 2.
Fig. 2.

Axial variation of: (a) the polymer neck-down profile, η(z)=Rp/Rw, (including the radial and axial location of the thermocouples in air) and (b) the wall temperature profile, Tw(z).

Fig. 3.
Fig. 3.

The model furnace. The inset of frame ‘A’ shows a sample raw PIV image in which the ‘necking’ polymer preform and olive oil particles can be seen.

Fig. 4.
Fig. 4.

Excursion of the air temperature and fiber diameter histories from the sample mean, illustrating: (a,b) laminar, (c,d) oscillatory, and (e,f) chaotic natural convection conditions. Note different scales on the y-axes.

Fig. 5.
Fig. 5.

Frequency spectrums of: (a) the air temperature and (b) the fiber diameter observations for the oscillatory (Tt=114.5°C) and chaotic (Tt=104.8°C) flow regimes.

Fig. 6.
Fig. 6.

Air temperature and fiber diameter histories recorded at: (a, b) Tt=108°C and (c, d) Tt=106°C, illustrating the occurrence of period doubling and its effect on the fiber diameter.

Fig. 7.
Fig. 7.

PIV vector plot of time-invariant, axi-symmetric, laminar flow in the furnace model.

Fig. 8.
Fig. 8.

Time history of the axial velocity measured at x=-0.018 m and z=0.096 m showing unsteady natural convection. A movie of one complete oscillation is shown in Fig. 9.

Fig. 9.
Fig. 9.

(1.21 MB) Movie showing the asymmetric oscillating flow field within the model furnace (4.50 MB version). (Location x=-0.018 m, z=0.096 m is marked with a white cross.)

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