Analytical and numerical solutions of Oldroyd 8-constant fluid in double-layer optical fiber coating / Zeeshan Khan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 1 (01/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 1 (01/2019) . - p. 235-248 Titre : Analytical and numerical solutions of Oldroyd 8-constant fluid in double-layer optical fiber coating Type de document : texte imprimé Auteurs : Zeeshan Khan, Auteur ; Haroon Ur Rasheed, Auteur ; Murad Ullah, Auteur ; Taza Gul, Auteur ; Akhtar Jan, Auteur Année de publication : 2019 Article en page(s) : p. 235-248 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse numérique Composites à fibres Fibres optiques Humide sur humide (revêtements) Optimale homotopique asymptotique, Méthode Revêtements multicouches Revêtements organiques Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Polymer flow during wire coating in a pressure-type casting die has been simulated under non-isothermal conditions. The flow is dependent on the wire velocity, geometry of the die, and the viscosity of the polymer. In the present study, the constitutive equation of an Oldroyd 8-constant fluid is used to characterize the rheology of the polymer melt. The equation describing the flow of polymer melt inside the die is solved (1) analytically by applying optimal homotopy asymptotic method (OHAM) and (2) numerically by the shooting method with Runge–Kutta–Fehlberg algorithm. The convergence of the series solution is established. The effect of physical characteristics of the problem has been discussed in detail through graphs by assigning numerical values for several parameters of interest. At the end, the present study is also compared with published work as a particular case and good agreement is found. Note de contenu : - Basic equations and the problem formulation - OHAM solution - Numerical solution DOI : 10.1007/s11998-018-0113-0 En ligne : https://link.springer.com/article/10.1007/s11998-018-0113-0 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31994 [article]

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Flow and heat transfer of two immiscible fluids in double-layer optical fiber coating / Zeeshan Khan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 6 (11/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 6 (11/2016) . - p. 1055-1063 Titre : Flow and heat transfer of two immiscible fluids in double-layer optical fiber coating Type de document : texte imprimé Auteurs : Zeeshan Khan, Auteur ; Saeed Islam, Auteur ; Rehan Ali Shah, Auteur ; Ilyas Khan, Auteur Année de publication : 2016 Article en page(s) : p. 1055-1063 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fibres optiques Modèles mathématiques Revêtements multicouches Thermocinétique Index. décimale : 667.9 Revêtements et enduits Résumé : The coatings of optical fibers are generally characterized by a multi-layer coating structure. In this work, the mathematical modeling of two immiscible non-Newtonian fluids for optical fiber coating inside a straight annular die is developed in the form of a nonlinear differential equation with nonhomogeneous boundary conditions. Two non-Newtonian fluids, namely power law and Phan-Thien–Tanner fluids, are used in the primary and secondary coating dies, respectively. An exact solution is obtained for velocity fields and temperature distributions for the primary and secondary coating resins. The thickness of coated fiber optics is also calculated for both layers. The effect of different emerging parameters on the solution is discussed and sketched. DOI : 10.1007/s11998-016-9817-1 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9817-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27261 [article]

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