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Three-dimensional flow analysis was performed by using COMSOL Multiphysics Chemical Engineering Module for the purpose of analyzing the flow properties and finding out the operating points of a test domain. Using material property table for an exemplary melt of LDPE (Low-Density Polyethylene), the logarithmic viscosity-shear rate graph was plotted and fitted to the 4–constant modified Carreau constitutive flow model for the numerical analysis of the viscosity. The resulting velocity, pressure and shear rate profiles within several cross–sections of the die were obtained as a contour plots. The comparison suggested that the software is able to estimate the flow domain effectively and can be used to compute operational points for any profile die flow domain.

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