"Visualisation and analysis of interfacial instability in the coextrusion of a LDPE melt.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F04%3A63502619" target="_blank" >RIV/70883521:28110/04:63502619 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

"Visualisation and analysis of interfacial instability in the coextrusion of a LDPE melt.

Original language description

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 observedin 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 t

Czech name

Vizualizace a analýza meziplošných nestabilit při koextrudování LDPE

Czech description

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.

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CD - Macromolecular chemistry

OECD FORD branch

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Project

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Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2004

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

PLASTICS RUBBER AND COMPOSITES

ISSN

1465-8011

e-ISSN

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Volume of the periodical

33

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

27-35

UT code for WoS article

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EID of the result in the Scopus database

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