Steady flow and heat transfer analysis of MHD flow of Phan-Thien-Tanner fluid in double-layer optical fiber coating analysis with slip conditions

2017 ◽  
Vol 37 (7) ◽  
pp. 729-740
Author(s):  
Zeeshan Khan ◽  
Saeed Islam ◽  
Rehan Ali Shah
Keyword(s):  
Heat Transfer ◽  
Optical Fiber ◽  
Double Layer ◽  
Optical Fibers ◽  
Fluid Model ◽  
Experimental Results ◽  
Slip Conditions ◽  
Fiber Coating ◽  
Layer Coating ◽  
Ptt Fluid

Abstract Modern optical fibers require a double-layer coating on the glass fiber in order to provide protection from signal attenuation and mechanical damage. The most important plastic resins used in wires and optical fibers are plastic polyvinyl chloride, low- and high-density polyethylene, nylon, and polysulfone. One of the most important things that affect the final product after processing is the design of the coating die. In the present study, double-layer optical fiber coating is performed using melt polymer satisfying the Phan-Thien-Tanner (PTT) fluid model in a pressure-type die. The fluid is electrically conducted in the presence of applied magnetic field. Wet-on-wet coating process is applied for double-layer optical fiber coating. The assumption of fully developed flow of PTT fluid model, two-layer liquid flows of an immiscible fluid, is modeled in an annular die of length L, where the fiber is dragged at a higher speed. The equations characterizing the flow ad heat transfer phenomena are solved exactly and the effects of emerging parameters are shown with the help of graphs. It is interesting to remark that an increase in the non-Newtonian parameters increases the velocity in the absence or presence of slip parameters, which coincides with the results reported earlier. Also, the effect of important parameters such as Deborah numbers, slip parameters, magnetic parameter, characteristic velocity, radii ratio, and Brinkman numbers on the axial velocity, flow rate, thickness of coated fiber optics, and temperature distribution are investigated. Furthermore, the results were compared with the experimental results already published. To the best of our knowledge, no such analysis of the double-layer coating flows of PTT fluid using slip conditions is available in the literature. At the end, the result of the present work is also compared with the experimental results already published by taking λ → 0 (non-Newtonian parameter).

scholarly journals Manufacturing of Double Layer Optical Fiber Coating Using Phan-Thien-Tanner Fluid as Coating Material

Coatings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 147 ◽  
Author(s):  
Zeeshan Khan ◽  
Haroon Ur Rasheed ◽  
S.O. Alharbi ◽  
Ilyas Khan ◽  
Tariq Abbas ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Glass Fiber ◽  
Fiber Optics ◽  
Double Layer ◽  
Polymer Melt ◽  
Deborah Number ◽  
Coating Process ◽  
Polymer Flow ◽  
Fiber Coating ◽  
Ptt Fluid

Modern optical fiber required a double-layer resin coating on the glass fiber to provide protection from signal attenuation and mechanical damage. The most important plastics resin used in coating of fiber optics are plasticized polyvinyle (PVC), low/high density polyethylene (LDPE/HDPE), nylon, and polysulfone. Polymer flow during optical fiber coating in a pressure type coating die has been simulated under non-isothermal conditions. The flow dependent on the wire or fiber velocity, geometry of the die, and the viscosity of the polymer. The wet-on-wet coating process is an efficient process for two-layer coating on the fiber optics. In the present study, the constitutive equation of polymer flow satisfies viscoelastic Phan-Thien-Tanner (PTT) fluid, is used to characterize rheology of the polymer melt. Based on the assumption of the fully developed incompressible and laminar flow, the viscoelastic fluid model of two-immiscible resins-layers modeled for simplified-geometry of capillary-annulus where the glass fiber drawing inside the die at high speed. The equation describing the flow of the polymer melt inside the die was solved, analytically and numerically, by the Runge-Kutta method. The effect of physical characteristics in the problem has been discussed in detail through graphs by assigning numerical values for several parameters of interest. It is observed that velocity increases with increasing values of ε D 1 2 , ε D 2 2 , X 1 , and X 2 . The volume flow rate increases with an increasing Deborah number. The thickness of coated fiber optic increases with increasing ε D 1 2 , ε D 2 2 , and δ . Increase in Brinkman number and Deborah number enhances the rate of heat transfer. It is our first attempt to model PTT fluid as a coating material for double-layer optical fiber coating using the wet-on-wet coating process. At the end, the present study is also compared with the published work as a particular case, and good agreement is found.

Analytic Study of Non-Newtonian Double Layer Coating Liquid Flows in Optical Fiber Manufacturing

2012 ◽  
Vol 224 ◽  
pp. 260-263 ◽  
Author(s):  
Kyoung Jin Kim ◽  
Ho Sang Kwak
Keyword(s):  
Optical Fiber ◽  
Glass Fiber ◽  
Double Layer ◽  
Optical Fibers ◽  
Newtonian Fluid ◽  
Liquid Flow ◽  
Analytic Study ◽  
Fiber Drawing ◽  
Drawing Speed ◽  
Layer Coating

In mass manufacturing of optical fibers, the wet-on-wet polymer resin coating is an efficient process for applying double layer coatings on the glass fiber. This paper presents an analytic study on the behavior of non-Newtonian polymer resins in the double layer coating liquid flow inside a secondary coating die of the optical fiber coating applicator. Based the approximations of fully developed laminar flow and the power law model of non-Newtonian fluid, the coating liquid flow of two immiscible resin layers is modeled for the simplified geometry of capillary annulus, where the surface of glass fiber moves at high fiber drawing speed. The effects of important parameters such as non-Newtonian fluid properties, the coating die size, and fiber drawing speed are investigated on the resin velocity profiles and secondary coating layer thickness.

Flow and heat transfer of two immiscible fluids in double-layer optical fiber coating

2016 ◽  
Vol 13 (6) ◽  
pp. 1055-1063 ◽  
Author(s):  
Zeeshan Khan ◽  
Saeed Islam ◽  
Rehan Ali Shah ◽  
Ilyas Khan
Keyword(s):  
Heat Transfer ◽  
Optical Fiber ◽  
Double Layer ◽  
Immiscible Fluids ◽  
Fiber Coating ◽  
Flow And Heat Transfer

High-Speed Optical-Fiber Coating with Viscoelastic PTT Fluid: Analytical and Numerical Solutions

2018 ◽  
Author(s):  
Zeeshan Khan ◽  
Haroon Ur Rasheed ◽  
Ilyas Khan
Keyword(s):  
Optical Fiber ◽  
Fiber Optics ◽  
High Speed ◽  
Numerical Solutions ◽  
Fluid Model ◽  
Polymer Melt ◽  
Polymer Flow ◽  
Fiber Coating ◽  
Runge Kutta Method ◽  
Ptt Fluid

Polymer flow during optical fiber coating in a pressure type coating die has been simulated under non-isothermal conditions. The flow dependent on the wire or fiber velocity, geometry of the die and the viscosity of the polymer. The wet-on-wet coating process is an efficient process for two-layer coating on the fiber optics. In the present study, the constitutive equation of polymer flow satisfies viscoelastic Phan-Thien Tanner (PTT) fluid, is used to characterize rheology of the polymer melt. Based on assumption fully developed incompressible and laminar flow, the viscoelastic fluid model of two-immiscible resins-layers modeled for simplified-geometry of capillary-annulus where the glass fiber drawing inside the die at high speed. The equation describing flow of polymer melt inside the die solved analytically and numerically by Runge-Kutta method. The effect of physical characteristics in problem has been discussed in detail through graphs by assigning numerical values for several parameters of interest. At the end, present study is also compared with the published work as a particular case and good agreement is found.

scholarly journals Multiple Light Coupling and Routing via a Microspherical Resonator Integrated in a T-Shaped Optical Fiber Configuration System

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 521 ◽  
Author(s):  
Georgia Konstantinou ◽  
Karolina Milenko ◽  
Kyriaki Kosma ◽  
Stavros Pissadakis
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Single Mode ◽  
Equatorial Region ◽  
Experimental Results ◽  
Glass Microsphere ◽  
Single Mode Optical Fiber ◽  
Light Coupling ◽  
Fiber Taper ◽  
Optical Fiber Taper

We demonstrate a three-port, light guiding and routing T-shaped configuration based on the combination of whispering gallery modes (WGMs) and micro-structured optical fibers (MOFs). This system includes a single mode optical fiber taper (SOFT), a slightly tapered MOF and a BaTiO3 microsphere for efficient light coupling and routing between these two optical fibers. The BaTiO3 glass microsphere is semi-immersed into one of the hollow capillaries of the MOF taper, while the single mode optical fiber taper is placed perpendicularly to the latter and in contact with the equatorial region of the microsphere. Experimental results are presented for different excitation and reading conditions through the WGM microspherical resonator, namely, through single mode optical fiber taper or the MOF. The experimental results indicate that light coupling between the MOF and the single mode optical fiber taper is facilitated at specific wavelengths, supported by the light localization characteristics of the BaTiO3 glass microsphere, with spectral Q-factors varying between 4.5 × 103 and 6.1 × 103, depending on the port and parity excitation.

Applications of Active Thin Film Coatings on Optical Fibers

1996 ◽  
Vol 459 ◽  
Author(s):  
G. R. Fox ◽  
C.A.P. Muller ◽  
C. R. Wüthrich ◽  
A. L. Kholkin ◽  
N. Setter ◽  
...  
Keyword(s):  
Thin Film ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Phase Shifters ◽  
Film Coatings ◽  
Thin Film Coatings ◽  
Fiber Coating ◽  
Wavelength Tunable ◽  
Fiber Devices ◽  
Recent Developments

ABSTRACTActive thin film coatings on optical fibers provide a variety of functions that are being used to develop active all-fiber optical devices. Two types of active coatings that are of interest for device development include resistive and piezoelectric coatings. Resistive coatings can be used to heat an optical fiber, while piezoelectric coatings can be used to strain the fiber. Localized changes in the fiber waveguiding properties can be achieved by electrically activating the fiber coating. These coated fibers show promise for applications such as optical phase shifters and modulators.Recent developments in the fabrication of diffraction gratings within the core of an optical fiber have provided the means for making a variety of intra-core reflection and band pass filters. By combining these passive intra-core fiber devices with active coatings, wavelength tunable devices have been demonstrated. Wavelength tunable devices are expected to have a variety of applications in telecommunications and sensing networks. A review of recent developments in fiber coating and analysis techniques, device fabrication, and applications of active all-fiber devices are presented along with a discussion of which coating materials are of interest in active devices.

Numerical simulation of double-layer optical fiber coating using Oldroyd 8-constant fluid as a coating material

2018 ◽  
Vol 57 (07) ◽  
pp. 1 ◽  
Author(s):  
Zeeshan Khan ◽  
Haroon Ur Rasheed ◽  
Qayyum Shah ◽  
Tariq Abbas ◽  
Murad Ullah
Keyword(s):  
Numerical Simulation ◽  
Optical Fiber ◽  
Double Layer ◽  
Coating Material ◽  
Fiber Coating

Double-layer optical fiber coating analysis using viscoelastic Sisko fluid as a coating material in a pressure-type coating die

2017 ◽  
Vol 56 (11) ◽  
pp. 1 ◽  
Author(s):  
Zeeshan Khan ◽  
Saeed Islam ◽  
Rehan Ali Shah ◽  
Nasir Siddiqui ◽  
Murad Ullah ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Double Layer ◽  
Coating Material ◽  
Sisko Fluid ◽  
Fiber Coating
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