Similarity Theory for Screw Machinery

Pawlowski extended the knowledge base and deepened understanding of the physical functions and operating methods of screw machinery considerably through the development of the similarity theory and its application to these machines [37 to 39]. His work significant consequences  

The four profile parameters are determined experimentally in a far less time consuming process. The measurements for co-rotating extruders from [40] in Figs. 2.24 and 2.25 show that Pawlowski s similarity method is valid in terms of flow engineering [37] even for this complex screw type. 

Reduction of dimension specific factors (7 — 3) according to J. Pawlowski [37], (for Newtonian media) 

Profile parameter A r A2, Br By Axial sections of straight-line equations 

Linear pressure and power characteristic of filled screws 

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