scholarly journals Steady flow and heat transfer analysis of Phan-Thein-Tanner fluid in double-layer optical fiber coating analysis with Slip Conditions

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Zeeshan Khan ◽  
Rehan Ali Shah ◽  
Saeed Islam ◽  
Bilal Jan ◽  
Muhammad Imran ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Optical Fiber ◽  
Steady Flow ◽  
Double Layer ◽  
Heat Transfer Analysis ◽  
Slip Conditions ◽  
Fiber Coating ◽  
Flow And Heat Transfer

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).

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

scholarly journals A Note on the Unsteady Incompressible MHD Fluid Flow with Slip Conditions and Porous Walls

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
H. Zaman ◽  
Z. Ahmad ◽  
M. Ayub
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Heat Transfer Analysis ◽  
Slip Parameter ◽  
Slip Conditions ◽  
Flow And Heat Transfer ◽  
Transient Velocity ◽  
Suction Or Injection ◽  
Incompressible Mhd ◽  
The Magnetic Field

This work is concerned with the influence of uniform suction or injection on flow and heat transfer analysis of unsteady incompressible magnetohydrodynamic (MHD) fluid with slip conditions. The resulting unsteady problem for velocity and heat transfer is solved by means of Laplace transform. The characteristics of the transient velocity, overall transient velocity, steady state velocity and heat transfer at the walls are analyzed and discussed. Graphical results reveal that the magnetic field, slip parameter, and suction (injection) have significant influences on the velocity, and temperature distributions, which also changes the heat transfer behaviors at the two plates. The results of Fang (2004) are also recovered by keeping magnetic field and slip parameter absent.

Flow and heat transfer analysis of lead–bismuth eutectic flowing in a tube under rolling conditions

2021 ◽  
Vol 382 ◽  
pp. 111373
Author(s):  
Zhipeng Liu ◽  
Daishun Huang ◽  
Chenglong Wang ◽  
Qifan Yu ◽  
Dalin Zhang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Analysis ◽  
Flow And Heat Transfer ◽  
Lead Bismuth Eutectic

Heat Transfer in Chemical Vapor Deposited Optical Fiber Coatings

2001 ◽  
Author(s):  
Patricia O. Iwanik ◽  
Wilson K. S. Chiu
Keyword(s):  
Heat Transfer ◽  
Optical Fiber ◽  
Gas Flow ◽  
Convection Heat Transfer ◽  
Fiber Surface ◽  
Chemical Vapor ◽  
Temperature Changes ◽  
Flow And Heat Transfer ◽  
Chemical Vapor Deposited ◽  
Fiber Coatings

Abstract A fundamental understanding of how reactor parameters influence the fiber surface temperature is essential to manufacturing high quality optical fiber coatings by chemical vapor deposition (CVD). In an attempt to better understand this process, a finite volume model has been developed to study the gas flow and heat transfer of an optical fiber as it travels through a CVD reactor. This study showed that draw speed significantly affects fiber temperature inside the reactor, with temperature changes up to 45% observed under the conditions studied. Multiple heat transfer modes contribute to this phenomena, with convection heat transfer dominating the process.

scholarly journals Numerical Study of the Effect of the Location of Baffles on the Flow and Heat Transfer of A Newtonian Fluid in A Ventilated Enclosure

2021 ◽  
Vol 321 ◽  
pp. 04007
Author(s):  
Abdelkader Boutra ◽  
Seddik Kherroubi ◽  
Abderrahmane Bourada ◽  
Youb Khaled Benkahla ◽  
Nabila Labsi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Study ◽  
Industrial Applications ◽  
Optimal Choice ◽  
Heat Transfer Analysis ◽  
Heat Conducting ◽  
Algebraic Equations ◽  
Pressure Line ◽  
Flow And Heat Transfer ◽  
Simpler Algorithm

Flow and heat transfer analysis in ventilated cavities is one of the most widely studied problems in thermo-fluids area. Two-dimensional mixed convection in a ventilated rectangular cavity with baffles is studied numerically and the fluid considered in this study is hot air (Pr = 0.71). The horizontal walls are maintained at a constant temperature, higher than that imposed on the vertical ones. Two very thin heat-conducting baffles are inserted inside the enclosure, on its horizontal walls, to control the flow of convective fluid. The governing equations are discretized using the finite volume method and the SIMPLER algorithm to treat the coupling velocity–pressure. Line by line method is used to solve iteratively the algebraic equations. The effect of the Richardson number Ri (0.01- 100) and the location of the baffles within the cavity on the isothermal lines, streamlines distributions and the average Nusselt number (Nu) has been investigated. The result shows that the location opposite the baffles, close to the fluid outlet, is the optimal choice to be considered for industrial applications.

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