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Related Experiment Video

Updated: Oct 30, 2025

A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump

A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump

Published on: June 1, 2022

Leakage-Flow Models for Screw Extruders.

Christian Marschik^1,2, Wolfgang Roland¹, Marius Dörner³

¹Institute of Polymer Extrusion and Compounding, Johannes Kepler University Linz, 4040 Linz, Austria.

|July 2, 2021

Summary

This summary is machine-generated.

New models accurately predict screw pumping capability by including flight clearance effects, crucial for advanced extruder designs. This improves predictions of flow rate, power consumption, and temperature development without altering down-channel flow equations.

Keywords:

extrusion leakage flow modeling and simulation polymer processing

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Last Updated: Oct 30, 2025

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Area of Science:

Polymer processing
Materials science
Mechanical engineering

Background:

Extrusion analysis often neglects flight clearance, impacting accuracy for advanced screw designs.
Existing models may not fully capture the complex flow dynamics influenced by varying clearances.

Purpose of the Study:

To develop novel leakage-flow models incorporating flight clearance effects in screw extruders.
To enhance predictions of pumping capability, power consumption, and temperature development.

Main Methods:

Developed regression models for shear-thinning flow through flight clearance.
Employed a hybrid approach combining analytical, numerical, and data-based modeling.
Integrated regression models with network theory for comprehensive analysis.

Main Results:

Accurate and fast regression models for flow rate and dissipation rate in leakage gaps.
New approximations effectively account for flight clearance in performance predictions.
Methodology is applicable across diverse screw designs and processing conditions.

Conclusions:

Flight clearance significantly impacts extruder performance and must be considered.
The developed hybrid modeling approach offers a versatile and accurate solution.
This work advances the theoretical understanding and practical application of screw extrusion analysis.