Processing flow behavior and modeling of polyethylene melts

  • Ruifeng(Ray) LiangEmail author


This paper presents experimental observations and numerical simulations of six polyethylene melts with different molecular structures in the planar flow with a confined slit. The polyethylene melts investigated include three low-density polyethylene grades (LDPE), two high density polyethylene grades (HDPE), and one linear low density polyethylene (LLDPE). The objectives are to reveal the differences in the rheological and processing flow properties of these polyethylene melts, and correlate those properties with their molecular structures. Through this study, the author would also like to present a successful approach using simple shear data, in terms of a Wagner integral constitutive equation, to predict processing flow behaviors of polymer melts at a reasonable accuracy.

Key words

extrusion planar entry flow rheological characterization numerical simulation die swell polyethylene melt polyflow Wagner integral equation 


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  1. [1]
    AHMED R, LIANG R, MACKLEY M R. The experimental observation and numerical prediction of planar entry flow and die swell for molten polyethylenes[J]. J Non-Newt Fluid Mechanics, 1995, 59: 129–153.CrossRefGoogle Scholar
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    WAGNER M H. Analysis of time-dependent nonlinear stress-growth data for shear and elongational flow of a low density branched polyethylene melt[J]. Rheol Acta, 1976, 15: 136–142.CrossRefGoogle Scholar

Copyright information

© Central South University Press, Sole distributor outside Mainland China: Springer 2007

Authors and Affiliations

  1. 1.Constructed Facilities Center and Department of Chemical EngineeringWest Virginia UniversityMorgantownUSA

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