Abstract
Polymer flow during wire coating using a conical unit has been simulated where the flow is dependent on the wire velocity, geometry of the unit and the viscosity of the polymer. When a solid continuum is pulled through an orifice filled with a viscous fluid, shearing takes place at the interface of the fluid and the solid surface. If the fluid film is converging in the direction of pull then, in addition to the shear force, a hydrodynamic pressure is generated. This hydrodynamic pressure can assist coating process of wire, strip and tube. In this paper a mathematical model has been developed in cylindrical coordinates for the velocity and pressure distribution within a tapered unit. Results are also obtained for different wire speeds in terms of the changes in viscosity, shear rate, shear stress and drawing force distributions within the unit.
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