Abstract
This paper considers the important aspects of solids conveying and unfilled channels in a single screw extruder. An analytical and numerical study is carried out to obtain the compaction of powdery material as it is conveyed downstream. The associated temperature and pressure rise are also determined. The effects of operating conditions, extruder geometry and friction factors at the surface are studied. For unfilled regions, experimental data are used to obtain an expression for the filled channel length. The flow in the filled region of the extruder is simulated to obtain the pressure and temperature rise, along with other quantities. Comparisons with experimental results on both of these aspects show good agreement. The results obtained will be useful in the simulation of the entire extrusion process.
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