Modeling and Simulation of Crystallization Processes in Polymer Melt Flows

Descher, Stefan

dc.date.accessioned	2021-01-07T16:10:19Z
dc.date.available	2021-01-07T16:10:19Z
dc.date.issued	2020
dc.identifier	doi:10.17170/kobra-202011022043
dc.identifier.uri	http://hdl.handle.net/123456789/12396
dc.description	Zugleich: Dissertation, Universität Kassel, 2020	ger
dc.language.iso	eng	eng
dc.publisher	kassel university press
dc.rights	Namensnennung - Weitergabe unter gleichen Bedingungen 4.0 International	*
dc.rights.uri	http://creativecommons.org/licenses/by-sa/4.0/	*
dc.subject	non-isothermal crystallization	eng
dc.subject	viscoelastic fluids	eng
dc.subject	CFD	eng
dc.subject	rheology	eng
dc.subject	profile extrusion	eng
dc.subject	injection molding	eng
dc.subject.ddc	600
dc.title	Modeling and Simulation of Crystallization Processes in Polymer Melt Flows	eng
dc.type	Buch
dcterms.abstract	The last stage of many manufacturing processes used in polymer processing industry are primary forming processes such as extrusion or injection molding. If melts of semicrystalline plastics are subjected to such processes, temperature control opens up the possibility of influencing solid state properties. This concerns those that depend on crystallinity, as it is possible to enhance crystallization by slow cooling or to suppress it by quenching. However, during the forming process the melt rarely rests, so that solidification processes in flows occur. Those complex processes can only be examined in detail by numerical simulation. The present work contributes to this by developing a novel modeling approach for isotactic polypropylene, detailed presentation and solution of problems in modeling and numerics, as well as exemplary studies for the calculation of a profile extrusion and injection molding process. Detailed calorimetric and rheometric investigations of the solidification behavior and a consideration of molecular processes during crystallization serve as a fundament for modeling. The crystallization model is based on the derivation of the crystallization progress from data of a dynamic scanning calorimetry over a large range of cooling rates. It enables the consideration of suppression of crystallization and a local determination of the crystallinity. The flow behavior of the melt is described by a thermorheological, generalized Maxwell model with the exponential expansion of Phan-Thien and Tanner. Solidified regions are modeled using an adequately parameterized Newtonian law. The numerical realization is done by implementing the modeling approaches in the open source CFD library OpenFOAM. To ensure reliability of the solver, the log-conformation reformulation, both side diffusion stabilization and block-coupled pressure-velocity coupling are used. Detailed studies for elementary static and dynamic problems verify the method and investigate the interaction of all modeling approaches. Parameter studies for realistic profile extrusion and injection molding configurations in 2D and 3D results show examples of application. The results show that the developed method allows to predict the interaction between melt and solidified domains and the crystallinity in the solid.	eng
dcterms.accessRights	open access
dcterms.creator	Descher, Stefan
dcterms.dateAccepted	2020-05-28
dcterms.extent	vi, VI, 145 Seiten
dcterms.isPartOf	Berichte des Instituts für Mechanik ;; 2/2020	ger
dc.contributor.corporatename	Kassel, Universität Kassel, Fachbereich Maschinenbau	ger
dc.contributor.referee	Wünsch, Olaf (Prof. Dr.)
dc.contributor.referee	Rütten, Markus (Prof. Dr.)
dc.publisher.place	Kassel
dc.relation.isbn	978-3-7376-0877-0
dc.subject.swd	Kristallisation	ger
dc.subject.swd	Viskoelastizität	ger
dc.subject.swd	Numerische Strömungssimulation	ger
dc.subject.swd	Rheologie	ger
dc.subject.swd	Profilextrusion	ger
dc.subject.swd	Spritzgießen	ger
dc.type.version	publishedVersion
dcterms.source.series	Berichte des Instituts für Mechanik	ger
dcterms.source.volume	2/2020	ger
kup.iskup	true
kup.order	https://www.genialokal.de/Produkt/Stefan-Descher/Modeling-and-Simulation-of-Crystallization-Processes-in-Polymer-Melt-Flows_lid_44492286.html
kup.price	39,00
kup.series	Berichte des Instituts für Mechanik
kup.subject	Naturwissenschaft, Technik, Informatik, Medizin
kup.typ	Dissertation
kup.institution	FB 15 / Maschinenbau
kup.binding	Softcover
kup.size	DIN A5