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Modeling Polymer Melt Flow Using the Particle Finite Element Method.


pdf icon Modeling Polymer Melt Flow Using the Particle Finite Element Method. (1100 K)
Butler, K. M.; Onate, E.; Idelsohn, S. R.; Rossi, R.

Volume 2;

Interflam 2007. (Interflam '07). International Interflam Conference, 11th Proceedings. Volume 2. September 3-5, 2007, London, England, 929-940 pp, 2007.

Keywords:

particles; melt flow; thermoplastics; flow field; equations; gasification; heat sources; finite element method; experiments; mass loss; flame spread; viscosity

Abstract:

A new particle-based approach is applied to the modeling of the melt flow behavior of thermoplastics. The Particle Finite Element Method (PFEM) combines convection of particles by the flow field with a finite element solution of the equations of motion and energy, in a fully Lagrangian formulation that tracks large changes in shape and topology. The potential of this method to model thermoplastic melt flow is tested with a series of computational problems based on flow from an upright rectangular sample heated on one face. The quasi-steady flow rate under three levels of heat flux is about 25 % higher than experimental results, in line with previous modeling results. The addition of gasification to the PFEM model provides good agreement with a 1D analytical model when the gasification layer is well-resolved. A model that includes dripping of the sample onto a catch surface below conserves mass within - 5 %.