ENTRY FLOW CALCULATIONS USING MULTIMODE MODELS

In this study, two rheological models, namely the Giesekus and the Pha n-Thien-Tanner models, are used to simulate the how of a viscoelastic polymer solution through a planar 4:1 contraction. Both stress and vel ocity fields are examined at different sections of the flow. The predi ctions of the numerical simulations using one-mode as well as four-mod e models are compared with the experimental results from the literatur e.