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- Publisher
- Springer Journals
- Copyright
- Copyright © 2004 by Kluwer Academic Publishers
- Subject
- Physics; Polymer Sciences; Industrial Chemistry/Chemical Engineering; Mechanics; Characterization and Evaluation Materials
- ISSN
- 1385-2000
- eISSN
- 1573-2738
- DOI
- 10.1023/B:MTDM.0000046795.16699.b8
- Publisher site
- See Article on Publisher Site
Abstract
The velocity distribution along the axis of a low-density polyethylene (LDPE) melt strand extruded through an axisymmetric capillary and drawn by various forces is simulated using an integral constitutive equation with a PSM damping function (Papanastasiou, Scriven, Macosko, Journal of Rheology, 27: 381–410, 1983). The simulations are performed for different drawdown forces of the strand. The numerical results are compared with experimental data obtained by velocity measurements using the laser-Doppler velocimetry. The strand is drawn by rotating wheels as used in a Rheotens™ testing device. At drawdown forces greater than zero the investigations show that the strand velocity does not increase linearly with increasing distance from the die exit. Instead, it is observed that the acceleration of the strand increases monotonically. Except in the next vicinity of the die exit there is a good agreement between simulation and experiment. However, near to the die the simulation predicts a higher strand velocity.
Journal
Mechanics of Time-Dependent Materials – Springer Journals
Published: Sep 1, 2004