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TitleGuidelines for balancing the flow in extrusion dies: the influence of the material rheology
Author(s)Rajkumar, Ananth
Ferrás, Luís Jorge Lima
Fernandes, Célio Bruno Pinto
Carneiro, O. S.
Nóbrega, J. M.
KeywordsComplex profile extrusion dies
Flow balancing
OpenFOAM (R)
Power-law index
Surrogate models
Issue date2018
PublisherWalter de Gruyter GmbH
JournalJournal of Polymer Engineering
Abstract(s)In this work we present improved design guidelines to support the die designer activity, when searching for the flow channel geometry that allows the achievement of a balanced flow distribution, in complex profile extrusion dies. The proposed methodology relies on surrogate models, obtained through a detailed and extensive numerical study, carried out with the open source computational library OpenFOAM (R), in which an appropriate numerical solver for the problems under study was implemented. The main contribution of this work is to further enlarge the applicability of the simplified design methodology (Rajkumar A, Ferras LL, Fernandes C, Carneiro OS, Becker M, Nobrega JM. Int. Polym. Proc. 2017, 32, 58-71.) previously proposed by this group for similar purposes, by considering the effect of processing parameters and material rheology. The sensitivity analyses performed showed that, among the studied parameters, the power-law exponent was the only one that affected the system behavior. Thus, the previous proposed surrogate models were modified to include the effect of this parameter. Verification studies performed for three geometries and different rheological and process parameters evidenced the effectiveness of the proposed simplified design methodology.
AccessRestricted access (UMinho)
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

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