Materials insight

Estimation of Elongational Viscosity of Polymers From Entrance Loss data Using Individual parameter Optimization

by PolyXtrue5,362 views

The elongational viscosity model proposed by Sarkar and Gupta (Journal of Reinforced Plastics and Composites 2001, 20, 1473), along with the Carreau model for shear viscosity is used for a finite element simulation of the flow in a capillary rheometer. The entrance pressure loss predicted by the finite element flow simulation is matched with the corresponding experimental data to predict the parameters in the elongational viscosity model. To improve the computational efficiency, various elongational viscosity parameters are optimized individually. Estimated elongational viscosity for a Low Density Polyethylene (DOW 132i) is reported for two different temperatures.

M. Gupta, Advances in Polymer Technology, 2002, Vol. 21, 98 - 107

ExtrusionPlasticsPolyXtrueResearch PapersRheology

Further reading

Links

About the author

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/

Keep exploring