Wire coating analysis with Oldroyd 8-constant fluid by Optimal Homotopy Asymptotic Method

In this study the wire coating in a pressure type die with the bath of Oldroyd 8-constant fluid with pressure gradient is investigated. The non-linear ordinary differential equation in dimensionless form is obtained, which is solved for the velocity profile using the Optimal Homotopy Asymptotic Method (OHAM). The effect of Dilatant constant alpha, the Psendoplastic constant beta, and the pressure gradient on velocity distribution and shear stress is studied. Shear stress is examined under the effect of the viscosity parameter eta(0). Moreover, the volume flow rate and average velocity is carefully studied with changing the domain (thickness) of the polymer and varying the parameter alpha, beta and the pressure gradient. (C) 2011 Elsevier Ltd. All rights reserved.