Numerical Simulation of Elongational Flow Effect and Piezoelectric Polymer Encounter in a Converging Cylindrical Die

Because of importance of crystal structure effect on specification of piezo-electric poly (vinylidene fluoride)، PVDF، and elongational flow effect on enhancement of this crystal structure، a new geometry is simulated in the form of cylindrical shape that includes a channel with convergence end zone. The melting flow in die was analyzed by the Fluent software. The results of this modeling show that there is very effective elongated flow in convergence zone. With the help of this research results a die could be made so to induce high elongation flow on melt. With the introduction of this technology the need for cold drawing of polymer will be eliminated and this simple geometry with a small modification could be used for processing of cylindrical films and hollow tubes.