Viscoelastic Behavior of Polyethylene in Capillary Flow Expressed with Three Material Functions

Abstract

It was shown that three material functions are required to relate various phenomena in the capillary flow of polyethylene. The phenomena examined are the entrance pressure loss, laminar flow through a capillary, memory decay in the flow, and extrudate swelling. A unified picture was constructed for the capillary flow and the energy balance was calculated.