In polymer extrusion, occurrence of wall slip can considerably alter t
he flow and mixing behavior. In most cases, it occurs in partially fil
led screw channels because starved feeding is very common in industria
l processing. in this payer an analytical model was developed to study
the extrusion flow of Newtonian fluids with wall slip in a partially
filled single screw extruder. Based on this analysis, the change of fl
ow due to wall slip phenomenon was analyzed. The effects of percent ch
annel fill, wall slip coefficient and viscosity on the flow and mixing
are investigated.