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Progress Report on Numerical Modeling of Experimental Polymer Melt Flow Behavior.

pdf icon Progress Report on Numerical Modeling of Experimental Polymer Melt Flow Behavior. (283 K)
Butler, K. M.; Ohlemiller, T. J.; Linteris, G. T.

Volume 2;

Interflam 2004. (Interflam '04). International Interflam Conference, 10th Proceedings. Volume 2. July 5-7, 2004. Organised by Interscience Communications Ltd. in association with National Institute of Standards and Technology, Building Research Establishment; National Fire Protection Association; Society of Fire Protection Engineers; and Swedish National Testing and Research Institute, Edinburgh, Scotland, Interscience Communications Ltd., London, England, 937-948 pp, 2004.


fire science; fire safety; material properties; numerical models; polymers; melt flow; thermoplastics; polypropylene; mass loss; temperature; kinetics


A combination of experiment and modeling is being used to investigate the effects of material properties on the melt flow behavior of thermoplastics. The dripping behavior of several types of polypropylene has been studied, including measurements of mass loss from the sample and mass collection in the catch pan, surface temperature, and surface velocities. An experimental method was developed for extrapolating viscosity data to high temperatures where bubbles in the polymer make standard rheometry impossible. Afinite volume model that uses the volume of fluid method to track the highly distorted interface for a melting and dripping polymer is described. The model includes heat flux to the distorted interface, empirical viscosity as a function of temperature, flow due to gravity, and gasification.