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Brought to you by:
The SPE Extrusion Division
Board of Directors

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AN ENGINEERING APPROACH TO THE CORRECTION OF ROTATIONAL FLOW CALCULATIONS FOR SINGLE-SCREW EXTRUDERS

Mark A. Spalding ¹, Gregory A. Campbell²
1 - The Dow Chemical Company, Midland, MI
2 - Castle Research Associates, Jonesport, ME


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Abstract

Simulation of single-screw extruder screws using the standard pseudo-Newtonian method is known to deviate from measured performance. Part of this deviation is caused by the calculation of the drag flow rate. Previous research has shown that the calculation of the drag flow rate using this method is higher than that in the actual channel, causing the pressure gradient to be incorrectly adjusted to compensate for the error in the drag flow term. The research provided here provides the correction factors for rotational flow (historically known as drag flow) such that axial pressure gradients can be quickly and accurately calculated.

To view the entire paper, please use the following link: Best Paper 2010.pdf