Ursula Stritzinger,
"Modeling Conveying and Power- Consumption Behavior of Fully Intermeshing Co-Rotating Twin- Screw Extruders"
, 11-2023
Original Titel:
Modeling Conveying and Power- Consumption Behavior of Fully Intermeshing Co-Rotating Twin- Screw Extruders
Sprache des Titels:
Englisch
Original Kurzfassung:
Extrusion is the most common processing technology for polymeric materials. Therefore, understanding the extrusion process is key to leading the polymer industry into a new era with more frugal energy consumption and better product quality. Modeling of single-extrusion has
significantly improved over the last decades and already yields pretty accurate descriptions of the process. Unfortunately, modeling of twin-screw extrusion is significantly lacking behind despite
being an integral part of the polymer industry. Fully intermeshing co-rotating twin-screw extruders are, for instance, commonly used for applications like compounding, recycling, and reactive extrusion. These three processing technologies will become more and more crucial in the next few years as the world finally realizes how valuable the resources are and will probably focus on the up-cycling of polymeric waste.
The primary goal of this thesis is to advance the twin-screw extrusion modeling and enable a more accurate description of the flow pattern by simple algebraic models. For this purpose, analytical, numerical, and data-based modeling approaches are combined to generate prediction models,
which consider the underlying physics of the flow. These models enable a fast computing description of the conveying and the power-consumption behavior of conveying elements and kneading blocks.
The analytical modeling approach ensures that the prediction models can be applied universally by including all commonly distributed kneading blocks and conveying elements. The models cover lab- to industrial-scale elements as well as conveying and non-conveying elements. While the numerical modeling approach guarantees that the complex three-dimensional geometry of the screw elements is considered, which leads to the inclusion of all leakage flows. The data-based modeling uses the dataset of the numerical modeling and generates prediction models encompassing the gained insights. Furthermore, an experimental validation proves the accuracy
of the presented models and demonstrates the achieved accuracy compared to existing approaches. The presented prediction models are easy to use due to their symbolic nature and can be computed fast without requiring further simulations. The experiments showed that they are a real
improvement compared to a state-of-the-art model. Additionally, the comprehensive parametric design studies provide significant new insights into the conveying and the power-consumption behavior of fully intermeshing co-rotating twin-screw extruders.
Sprache der Kurzfassung:
Englisch
Englische Kurzfassung:
Extrusion is the most common processing technology for polymeric materials. Therefore,
understanding the extrusion process is key to leading the polymer industry into a new era with
more frugal energy consumption and better product quality. Modeling of single-extrusion has
significantly improved over the last decades and already yields pretty accurate descriptions of the
process. Unfortunately, modeling of twin-screw extrusion is significantly lacking behind despite
being an integral part of the polymer industry. Fully intermeshing co-rotating twin-screw extruders
are, for instance, commonly used for applications like compounding, recycling, and reactive
extrusion. These three processing technologies will become more and more crucial in the next few
years as the world finally realizes how valuable the resources are and will probably focus on the
up-cycling of polymeric waste.
The primary goal of this thesis is to advance the twin-screw extrusion modeling and enable a more
accurate description of the flow pattern by simple algebraic models. For this purpose, analytical,
numerical, and data-based modeling approaches are combined to generate prediction models,
which consider the underlying physics of the flow. These models enable a fast computing
description of the conveying and the power-consumption behavior of conveying elements and
kneading blocks.
The analytical modeling approach ensures that the prediction models can be applied universally
by including all commonly distributed kneading blocks and conveying elements. The models cover
lab- to industrial-scale elements as well as conveying and non-conveying elements. While the
numerical modeling approach guarantees that the complex three-dimensional geometry of the
screw elements is considered, which leads to the inclusion of all leakage flows. The data-based
modeling uses the dataset of the numerical modeling and generates prediction models
encompassing the gained insights. Furthermore, an experimental validation proves the accuracy
of the presented models and demonstrates the achieved accuracy compared to existing
approaches.
The presented prediction models are easy to use due to their symbolic nature and can be
computed fast without requiring further simulations. The experiments showed that they are a real
improvement compared to a state-of-the-art model. Additionally, the comprehensive parametric
design studies provide significant new insights into the conveying and the power-consumption
behavior of fully intermeshing co-rotating twin-screw extruders.
Forschungs-