Pressure drops in convergent flows of polymer melts

Practical moulding processes of polymer melts involve geometrically complex dies. Such dies are usually tapered or streamlined as e.g. wedge or conical dies, to achieve maximum output rate under conditions of laminar flow. The models of generalized second grade fluids of a Shulman type are used and the results obtained are illustrated by examples of conical and wedge flows of power-law type and Bingham type fluids and the formulae for pressure drops were presented.