Abstract
The main aim of this paper is to evaluate the applicability of a Modified Giesekus model to numerical simulation of double-layer flow in the spinning process. Numerical simulations of doublelayer flow from tube-in-orifice spinnerets have been carried out using a Modified Giesekus model. The streamline-upwinding finite element method with 4×4 sub-elements on stress components and over-relaxation method for equation of motion were used. In addition, the extrudate swell and interface shape have been experimentally observed for PVP (poly (vinylpyrrolidone)) aq./water system and comparisons between the numerical and the experimental results were made. It was found through both numerical predictions and experiments that extrudate swell shape is strongly dependent on the location of the center tube edge in a tube-in-orifice spinneret. Furthermore, the numerical and the experimental results are in good agreement for spinnerets with flush and projected center-tube. However, deviations have been found for the spinnerets with recessed center-tube. In addition, it was found that the Modified Giesekus model's prediction gives smaller swell compared to the original Giesekus one due to rapid stress relaxation.
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