A Method for the Validation of Simulated Mixing Characteristics of Two Dynamic Mixers in Single-Screw Extrusion

Autor: Christian Hopmann, Maximilian Mathias Reul, Martin Facklam, Malte Schön
Rok vydání: 2020
Předmět:
Zdroj: Polymers, Vol 12, Iss 2234, p 2234 (2020)
Polymers
Volume 12
Issue 10
Polymers 12(10), 2234 (2020). doi:10.3390/polym12102234 special issue: "Special Issue "Advances in Screw Processing of Polymeric Materials-In Memory of Professor James Lindsay White" / Special Issue Editors: Prof. Dr. Krzysztof Wilczyński, Dr. Andrzej Nastaj, Dr. Adrian Lewandowski, Dr. Krzysztof J. Wilczyński"
ISSN: 2073-4360
DOI: 10.3390/polym12102234
Popis: The field of simulation and optimisation of dynamic mixing elements (&lsquo
mixers&rsquo
) is lacking good methods for spatially resolved validation and flow visualisation. For this reason, the authors present an experimental setup that gives better insight into the thermal, distributive and dispersive mixing process by measuring melt temperatures upstream of the mixer and injecting a secondary, visually distinguishable stream of melt upstream. Running extrusion trials for a polyethylene on both a rhomboidal and a Maddock mixer, temperatures, gray scale distribution of images of extrudates and size of dispersed domains in incompatible polystyrene were measured. It was found that temperatures upstream and downstream of the mixer can be quantified. This was used to validate a simulation of thermal mixing. In distributive mixing, good agreement with simulation and an excellent spatial resolution were observed, thereby identifying an area of the rhomboidal mixer in need of geometric improvement. For dispersive mixing, a trend coherent with extrusion theory was found.
Databáze: OpenAIRE
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