광섬유 냉각장치의 헬륨 주입기 설계를 위한 전산열유동해석

초록

In a mass manufacturing system of optical fibers, the sufficient cooling of glass fibers freshly drawn from adraw furnace is essential, asinadequately cooled glass fibers canlead to poor resin coating on the fiber surface and possibly fiber breakage during the process. In order to improve fiber cooling at a high drawing speed, it is common to use a helium injection into a glass fiber cooling unit in spite of the high cost of the helium supply. The present numerical analysis carried out three-dimensional thermo-fluid computations of the cooling gas flow and heat transfer on moving glass fiber to determinethe cooling performance of glass fiber cooling depending on the method of helium injection. The results showed that afront injection of helium is most effective compared to a uniform or rear injection forreducing air entrainment into the unit and thus cooling the glass fibers at a high fiber drawingspeed. However, above a certain amount of injected helium, there was no more increase ofthe cooling effect regardless of the helium injection method.

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