Two-phase coating flows of a non-Newtonian fluid with linearly varying temperature at the boundaries—an exact solution

Zeeshan Khan; Muhammad Altaf Khan; Ilyas Khan; Saeed Islam; Nasir Siddiqui

doi:10.1117/1.OE.56.7.075104

22 July 2017 Two-phase coating flows of a non-Newtonian fluid with linearly varying temperature at the boundaries—an exact solution

Zeeshan Khan, Muhammad Altaf Khan, Ilyas Khan, Saeed Islam, Nasir Siddiqui

Author Affiliations +

Optical Engineering, Vol. 56, Issue 7, 075104 (July 2017). https://doi.org/10.1117/1.OE.56.7.075104

Abstract

We have explored double-layer-coated fiber optics using two-phase immiscible non-Newtonian fluid as a polymeric material. We have considered two layers, the first layer is assumed of soft material and the second consists of hard material. Resin flows are driven by fast-moving glass fiber and the pressurization at the coating die inlet. Two cases of temperature linearly varying at the boundaries have been discussed. The assumption of fully developed flow of non-Newtonian fluid permits an exact solution to the Navier–Stokes equations. The thickness of the secondary coating resin and the shear stress on the glass fiber, which are two basic output variables of practical concern, have been examined by several input parameters: two geometric parameters, i.e., radius of the glass fiber R_w and radius of the coating die R_d; two operational parameters, i.e., the velocity ratio U and power indices n_1,2; the non-Newtonian parameter S_1,2; and the nondimensional parameters H and ϕ. The comparison of the present work with published result predicts the close agreement.

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Zeeshan Khan, Muhammad Altaf Khan, Ilyas Khan, Saeed Islam, and Nasir Siddiqui "Two-phase coating flows of a non-Newtonian fluid with linearly varying temperature at the boundaries—an exact solution," Optical Engineering 56(7), 075104 (22 July 2017). https://doi.org/10.1117/1.OE.56.7.075104

Received: 17 May 2017; Accepted: 26 June 2017; Published: 22 July 2017

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