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Vizualizace a analýza meziplošných nestabilit při koextrudování LDPE

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dc.title Vizualizace a analýza meziplošných nestabilit při koextrudování LDPE cs
dc.title Visualisation and analysis of interfacial instability in the coextrusion of a LDPE melt en
dc.contributor.author Martyn, Mike T.
dc.contributor.author Spares, Rob
dc.contributor.author Coates, Phil D.
dc.contributor.author Zatloukal, Martin
dc.relation.ispartof Plastics, Rubber and Composites: Macromolecular Engineering
dc.identifier.issn 1465-8011 OCLC, Ulrich, Sherpa/RoMEO, JCR
dc.date.issued 2004
utb.relation.volume 33
utb.relation.issue 1
dc.citation.spage 27
dc.citation.epage 35
dc.type article
dc.language.iso en
dc.publisher Maney Publishing en
dc.subject vizualizace toku cs
dc.subject koextruze cs
dc.subject viskoelasticita cs
dc.subject modelování cs
dc.subject flow visualization en
dc.subject coextrusion en
dc.subject viscoelasticity en
dc.subject modeling en
dc.description.abstract Byly studovány mezifázové nestability typu "wave", a to na základě experimentálního měření na vizualizační cele s využitím viskoelastické FEM analýzy s využitím Leonovova modelu. Bylo zjištěno, že celkový rozdíl normálových napětí na rozhraní v oblasti stoku mění své znaménko, což koresponduje se vznikem mezifázových nestabilit. cs
dc.description.abstract Details presented cover the study of interfacial instability of a low density polyethylene melt flow in a coextrusion flow visualisation cell. The cell design splits a single melt feed into two meltstreams using a flow divider. The meltstreams are made to converge at an angle of 30° and flow into a common die land of 1.0 mm height. The flows in the confluent region and die land to the die exit were observed through the side windows of the cell. The relative stream velocities, hence layer thickness ratio, of the two streams were varied using an adjustable restriction plate in the bottom channel. Stress and velocity fields were quantified using stress birefringence and particle image velocimetry techniques. Wave type interfacial instability was observed in the extrudate when the major/minor stream layer thickness ratio exceeded 2 : 1. Flow at immediate entry to the die land appeared stable when the extrudate exhibited instability. However, a disturbance was observed in the flow towards the exit of the die land. The frequency of the disturbance was quantified and found to be the same as that of the wave disturbance in the extrudate. A modified Leonov model and Flow 2000 software were used to simulate the melt flow through the geometry. A total normal stress difference (TNSD) sign criterion has been used to predict the presence of the wave interfacial instabilities in the coextrusion geometry. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1000368
utb.identifier.rivid RIV/70883521:28110/04:63502619
utb.identifier.obdid 12052461
utb.identifier.scopus 2-s2.0-3042781390
utb.identifier.wok 000222786700006
utb.identifier.coden PRUCF
utb.source j-riv
utb.contributor.internalauthor Zatloukal, Martin
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