Newtonian Flow in the Metering Section of a Single Screw Extruder

1 Newtonian Flow in the Metering Section of a Single Screw Extruder 

Analyzing the flow in a single screw extruder using analytical solutions can only be done if we assume a Newtonian polymer melt. As can be seen in these sections, the flow inside the screw channel is a three dimensional flow made up of a combination of pressure and drag flows. Non-Newtonian flow can be solved for using numerical techniques and will be covered in Chapters 8 to 11 of this book. 

To correct this effect, which significantly affects extruders with a deep channel screw, Tadmor and Gogos [25] present the following modification 

It should be noted that the correction is less than 5% for channels that have an aspect ratio, W/h, larger than 10. 

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