Abstract
The three-dimensional flow of Non-Newtonian polymer melts in coextrusion dies was analyzed based on finite element simulations. The analysis considered the slip both die wall-polymer and polymer-polymer interface. The slip boundary condition is founded based on the Generalized Navier slippage model. The effects of die wall roughness on the interface were examined farther. It is found that decreasing the roughness of the fluid path can make the velocity field more uniform and the interfacial offset less. If consider the interface alip of two melts, the homologous of interface-slip coefficient and die-wall slip coefficient may ensure the stabilization of the interface.
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