Comparison of Viscous and Viscoelastic Fluids

In order to illustrate the specific material properties of polymers, we compare a viscous fluid (silicone oil) with a viscoelastic shear thinning fluid (aqueous polyethylene oxide solution). These fluids are used as model fluids in order to show the flow behavior limits for polymer melts, which corresponds to the behavior of a viscous fluid at very low shear rates and to the behavior of a shear thinning fluid at very high shear rates. 

Both cases are referred to in subsequent chapters with different numerical values for the material constants. For instance, calculating the pressure build-up in the extruder  

Examples are given for the three-dimensional modeling in order to calculate the speed-, pressure-and temperature fields of filled screw elements  

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