Simulation of pressure drop for combined tapered and nontapered die for polypropylene using ansys Polyflow

the pressure drop in combined sections tapered and circular for the flow of polypropylene were studied both analytical and simulation under isothermal and no-slip condition in the die wall. The predicted pressure drop values are compared with three-dimensional (3D) finite element simulation to identify effect of contraction angles, die land and radius on pressure drop. The governing equation of pressure drop was first derived to angle of tapered section, for circular section the pressure drop was studied using different die lands and radii .The three parameters were varied in the ansys Polyflow at specified polymer flow rate and the results are compared with analytical results .For the tapered section the best angle is analytically and for the simulation. For circular section of the die the results for die lands variations are almost the same but when varying the varying the radius the results differ at radii less than 2 cm and approach each other at 2 cm and above.