Abstract
The polymer melt processing gives rise to different flow situations in different processing equipment. The rate of shear of melt in mixers and extruders is relatively smaller as compared to that in injection moulding. As the viscosity of the polymer melt being very high the flow regime is invariably laminar but the flow through the runner and the gate of the injection moulding may become turbulent as the flow cross sections of these flow channels are small. This chapter contains the laminar flow analysis of different non-Newtonian fluids including the velocity distribution, shear stress and rate of shear distribution, true shear stress and rate of shear for melt flow, energy loss correction factors, flow through the non-circular flow channels, slip velocity, transition between laminar and turbulent flow, turbulent flow analysis, modified Reynolds number for non-Newtonian fluids, friction factor Reynolds number relations and extensional flow analysis.
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