Abstract
The flow rate of molten arsenic selenide in circular-cylindrical channels was measured as a function of temperature and excess gas pressure over the melt with application to the fabrication of optical fibers by cru- cible methods. The channel diameter was 3.0, 4.2, and 4.5 mm, and the channel length was 120 mm. The tem- perature was varied from 285 to 320 ° C, and the excess pressure of the inert gas was up to 1.5 × 10 5 Pa. The results demonstrate that there is a threshold pressure for melt flow, suggesting that the melt is a viscoplastic fluid. The experimental data are interpreted in terms of the Shvedov-Bingham rheological model.
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