Visualization and modelling of LDPE interfacial instability in coextrusion geometries
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F04%3A63502620" target="_blank" >RIV/70883521:28110/04:63502620 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Visualization and modelling of LDPE interfacial instability in coextrusion geometries
Original language description
Flow visualisation studies have been used to study the effects of die geometry on interfacial instabilities in coextrusion flows of LDPE melts. Slit coextrusion visualisation cells with 30° and 90° convergent stream angles are used in this study, particularly examining the region of flow concurrence. Stream flow ratios leading to interfacial instability in LDPE melts are quantified and compared for each geometry. Computer modelling of these viscoelastic flows has been undertaken, using a White-Metzner model with a modified Leonov model. This shows excellent agreement with the detailed flow velocity and stress birefringence results, and emphasizes the importance of extensional flow in the die. All of the original studies were conducted on a die which split then recombined a single melt stream; a new die has been built which allows two matched extruders to feed different polymers into a visualization cell. Initial results from this cell will also be reported.
Czech name
Vizualizace a modelování meziplošných nestabilit při koextruz tavenin LDPE
Czech description
Byl studován vliv vstupního úhlu tokového kanálu v koextruzní hlavě na vznik vlnových meziplošných nestabilit u polyolefinů a to jak experimentálně, tak i teoreticky. Bylo zjištěno že FEM analýza s využitím viskoelastického modelu popisuje dostatečně přesně rychlostní pole, poloho rozhraní a napěťový stav taveniny při koextruzním toku.
Classification
Type
D - Article in proceedings
CEP classification
CD - Macromolecular chemistry
OECD FORD branch
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Result continuities
Project
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Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2004
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
PPS-20
ISBN
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ISSN
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e-ISSN
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Number of pages
9
Pages from-to
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Publisher name
Polymer Processing Society
Place of publication
Akron
Event location
Akron, Ohio, USA
Event date
Jun 20, 2004
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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