Abstract
Numerical simulations of non-isothermal multi-interface flow of polymer fluids in circular and annular dies have been carried out. The present finite difference scheme was formulated based on control volume approach to solve the transformed gov erning equations. The stream function was used as the cross-stream coordinate in these equations. The fluid viscosity is described by a truncated power law with Arrhenius type temperature dependency. Comparisons were made among single phase, two-layer, and three-layer flow in a circular die to demonstrate that the center layer structure difference among them does not make a significant difference in viscous dissipation and nominal shear rate. Also included is the analysis of non-isothermal four-layer concentric coextru sion flow in an annular die.
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