SLIP-FLOW IN PARTIALLY FILLED SCREW CHANNEL

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.