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Estimation of Elongational Viscosity Using Entrance Flow Simulation

by PolyXtrue5,529 views

A new elongational viscosity model along with the Carreau-Yasuda model for shear viscosity is used for a finite element simulation of the flow in a capillary rheometer die. The entrance pressure loss predicted by the finite element flow simulation is matched with the corresponding experimental data to predict the parameters in the new elongational viscosity model. For two different polymers, the predicted elongational viscosity is compared with the corresponding predictions from Cogswell’s analysis and K-BKZ model.

D. Sarkar and M. Gupta, in CAE and Related Innovations for Polymer Processing”, L.S. Turng, H. P. Wang, K. Ramani and A. Bernard (Eds.), November 2000, ASME MD-Vol. 90, 309-318. 

ExtrusionPlasticsPolyXtrueResearch PapersRheology

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PolyXtrue

Plastic Flow’s extrusion die design software, polyXtrue, is based upon a unique and proprietary theory that simulates flow of polymers taking into account not only the shear viscosity, but also the elongational viscosity of the polymer.  To simulate a multilayer flow during coextrusion, polyXtrue uses a newly developed algorithm, called Mesh Partitioning Technique, which allows coextrusion simulation without changing the finite element mesh as the shape of different polymer layers change during simulation.  Thereby, allowing simulation of the flow even in highly complex coextrusion dies.

http://plasticflow.com/

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