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http://dx.doi.org/10.6112/kscfe.2016.21.4.011

EFFECTS OF CONVERGENT ANGLE OF NOZZLE CONTRACTION ON HIGH-SPEED OPTICAL FIBER COATING FLOW  

Park, S. (Dept. of Mechanical System Engineering, Kumoh National Institute of Technology)
Kim, K. (Dept. of Mechanical System Engineering, Kumoh National Institute of Technology)
Kwak, H.S. (Dept. of Mechanical System Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of computational fluids engineering / v.21, no.4, 2016 , pp. 11-18 More about this Journal
Abstract
A numerical study is conducted on the optical fiber coating flow in a primary coating nozzle consisting of three major parts: a resin chamber, a contraction and a coating die of small diameter. The flow is driven by the optical fiber penetrating the center of the nozzle at a high speed. The axisymmetric two-dimensional flow and heat transfer induced by viscous heating are examined based on the laminar flow assumption. Numerical experiments are performed with varying the convergent angle of nozzle contraction and the optical fiber drawing speed. The numerical results show that for high drawing speed greater than 30 m/s, there is a transition in the essential flow features depending on the convergent angle. For a large convergent angle greater than $30^{\circ}$, unfavorable multicellular flow structures are monitored, which could be associated with wall boundary-layer separation. In the regime of small convergent angle, as the angle increases, the highest resin temperature at the exit of die and the coating thickness decrease but the sensitivity of coating thickness on drawing speed and the maximum shear strain of resin on the optical fiber increase. The effects of the convergent angle are discussed in view of compromise searching for an appropriate angle for high-speed optical fiber coating.
Keywords
Optical Fiber Coating; Coating Nozzle; Convergent Angle; Viscous Heating; Coating Process; Thermal Flow;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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