scholarly journals Double-layer optical fiber coating analysis in MHD flow of an elastico-viscous fluid using wet-on-wet coating process

2017 ◽  
Vol 7 ◽  
pp. 107-118 ◽  
Author(s):  
Zeeshan Khan ◽  
Saeed Islam ◽  
Rehan Ali Shah ◽  
Muhammad Altaf Khan ◽  
Ebenezer Bonyah ◽  
...  
Keyword(s):  
Viscous Fluid ◽  
Optical Fiber ◽  
Double Layer ◽  
Mhd Flow ◽  
Coating Process ◽  
Fiber Coating

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.

scholarly journals MHD Flow and Heat Transfer Analysis in Wire Coating Process Using Elastic-Viscous Fluid

2017 ◽  
Author(s):  
Zeeshan Khan ◽  
Rahan Ali Shah ◽  
Saeed Islam ◽  
Hamid Jan ◽  
Bilal Jan ◽  
...  
Keyword(s):  
Viscous Fluid ◽  
Linear Equations ◽  
Adomian Decomposition Method ◽  
Mhd Flow ◽  
Heat Transfer Analysis ◽  
Coating Process ◽  
Flow And Heat Transfer ◽  
Adomian Decomposition ◽  
Wire Coating ◽  
Optimal Homotopy Asymptotic Method

The most important plastic resins used for wire coating are Polyvinyl Chloride (PVC), Nylon, Polysulfone and Low-high density polyethylene (LDPE / HDPE). In this article,the coating process is performed using elastic-viscous fluid as a coating material for wire coating in a pressure type coating die. The elastic-viscous fluid is electrically conducted in the presence of an applied magnetic field. The governing non-linear equations are modeled and then solved analytically by utilizing an Adomian decomposition method (ADM). The convergence of the series solution is established. The results are also verified by Optimal Homotopy Asymptotic Method (OHAM). The effect of different emerging parameters such as non-Newtonian parameters α and β, magnetic parameter M and the Brinkman number Br on solutions (velocity and temperature profiles) are discussed through several graphs. Additionally, the current result also compares with the published work already available in the literature.

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

Conjugate Heat Transfer in an Optical Fiber Coating Process

2005 ◽  
Author(s):  
Sang-Yeoun Yoo ◽  
Yogesh Jaluria
Keyword(s):  
Heat Transfer ◽  
Optical Fiber ◽  
Conjugate Heat Transfer ◽  
Fiber Surface ◽  
Ultra Violet ◽  
Thermal Conditions ◽  
Coating Process ◽  
Uv Curable ◽  
Fiber Coating

The optical fiber coating process in an axi-symmetric applicator and die system was simulated in this study. Various thermal conditions and process variables are investigated. Ultra-violet (UV) curable acrylates are used for the coating material, whose properties are highly dependent on temperature. Conjugate heat transfer is considered at the moving fiber surface since the fiber constantly exchanges energy with the contacting fluid. The temperature level in the applicator and die is found to increase with fiber speed, the increase being the highest in the die whose wall temperature is kept fixed. This high temperature rise is primarily due to the tremendous viscous dissipation within the fluid, especially in the die. It is important to avoid high temperatures in the fluid because the polymer starts to crosslink and degrade. The fiber temperature at the entrance was also found to be of substantial importance. This work can be used to improve the quality of the coating, particularly its uniformity, and the production rate.

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).

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