Abstract
Modern optical fibers require double-layer coating on the glass fiber to provide protection from signal attenuation and mechanical damage. The most important plastic resins used in wires and optical fibers are plastic polyvinyl chloride (PVC) and low-high density polyethylene (LDPE/HDPE), nylon and Polysulfone. In this paper, double-layer optical fiber coating is performed using melt polymer satisfying PTT fluid model in a pressure type die using wet-on-wet coating process. The assumption of fully developed flow of Phan-Thien-Tanner (PTT) fluid model, two-layer liquid flows of an immiscible fluid is modeled in an annular die, where the fiber is dragged at a higher speed. The equations characterizing the flow and heat transfer phenomena are solved exactly and the effects of emerging parameters (Deborah and slip parameters, characteristic velocity, radii ratio and Brinkman numbers on the axial velocity, flow rate, thickness of coated fiber optics, and temperature distribution) are reported in graphs. It is shown that an increase in the non-Newtonian parameters increase the velocity in the absence or presence of slip parameters which coincides with related work. The comparison is done with experimental work by taking λ → 0 (non-Newtonian parameter).
Highlights
In wet-on-dry coating process, the glass fiber passes through a primary coating applicator which is immediately cured by UV lamps, and the fiber enters a secondary coating applicator, again followed by UV lamps
Different types of fluids are used for wire and fiber optics coating, which depends upon the geometry of die, fluid viscosity, temperature of the wire or fiber optics and the molten polymer
Wet-on-wet coating process is applied for double-layer optical fiber coating. rnautmiTobh(eerraestfifBoercb1tseatnowfdedBeifnrf2etarhereentpdpriseecsrustiusnsreeenddtarpnoadprasamknedettctehhresedssupinceheFdaigso,ssf3lti,ph4ep, 5wa,ria6rme, 7ie,.te8e.,rs9X,Dj1=0e,b1oVU1rca,)h1, 2rna,ud1m3iiabrneartdiso1ε4Dδ.,12ananddthεeDB22r,ivneklomciatny
Summary
In wet-on-dry coating process, the glass fiber passes through a primary coating applicator which is immediately cured by UV lamps, and the fiber enters a secondary coating applicator, again followed by UV lamps. The majority of optical fiber drawing systems used the wet-on-dry process, but recently the wet-on-wet coating process has gained significant popularity in optical fiber manufacturing industry. After leaving the die, the temperature of the coating material is important. Unsteady second grade fluid with oscillating boundary condition inside the wire coating die was investigated by Shah et al.. Oldroyd 8-constant fluid was used for wire coating analysis by Shah et al.. Shah et al. studied third grade fluid with heat transfer in the wire coating analysis
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