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Extrudate swell through an orifice die
Authors:Junsuo Sun  Prof Nhan Phan-Thien  Roger Ian Tanner
Institution:(1) Department of Mechanical and Mechatronic Engineering, The University of Sydney, 2006 Sydney, NSW, Australia
Abstract:The extrudate swell of a viscoelastic fluid through an orifice die is investigated by using a mixed finite element and a streamline integration method (FESIM), using a version of the K-BKZ model. The free surface calculation is based on a local mass conservation scheme and an approximate numerical treatment for the contact point movement of the free surface. The numerical results show a vortex growth and an increasing swelling ratio with the Weissenberg number. Convergence with mesh refinement is demonstrated, even at a high Weissenberg number of O(587), where the swelling ratio reaches a value of about 360%. In addition, it is found that the effective flow channel at the entrance region next to the orifice die is reduced due to the enhanced vortex growth, which may be a source of flow instability.
Keywords:Finite element/streamline integration method  simulation of extrudate swell from orifice die  LDPE extrusion
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